Here's the dialog of interview with Seiji Mizushima, the director of the series:
[Other than the claim that Graham is ‘dead’ (translation?), which I don’t believe at all, the rest of things that Mizushima mentioned sounds interesting.]
水島のインタがメディアに二ページ
Mizushima’s Interview
-では、ロックオンは本当に死んじゃったんですか?
-Is Lockon really dead ?
水島:残念ながら。
Mizushima :- Yes, I’m afraid so,
-本当に!?だって、すごい人気で、ファンのみんな、号泣してますよ。あ
の23話には!
-Really !? He has a lot of fans and you left all of them heartbroken at Episode 23 !
水島:それは有難い話だけど、それとこれとは話は別だよ
Mizushima :- I appreciate that. But those are rally 2 different matters altogether.
-チッ…。墓地で見た「もうひとりのロックオン」は誰だったんでしょう?
-Damn you….But who’s the other Lockon that we say in the graveyard scene ?
水島:まぁ、あのシーンはどっちがロックオンだったのかという噂もでてい
るようですが
それも含めて…
Mizushima :- Oh, that scene ? But who’s really Lockon in that scene. That is something I’ll have to let other fiigured that out.
-ロックオンのハロは、ネーナの持っていたハロとルーツは同じなんですか
?80年前の
回想でも出てきてるってことは、ハロはいつ誰が作ったんだ?
Lockon’s Haro and Neena’s Halo, are they stemmed from the same root ? From that flashback 80 years ago, who really made them ?
水島:80年前の回想で見つけた木星探査船、あそこにあったのが最初のハロ
かどうかも
わからないので、なんともいえないところだね。もっとずっと前からあった
かもしれないし。ただ 、
少なくともCBにはいっぱいあったということじゃないかな。トレミーにいる
のはオレンジを「お 兄様」
「兄者」などと予備、そのオレンジが紫を「兄さん」と呼ぶのだから、この
紫がこの中では一番
古いのかなという気はしますけどね…この辺もセカンドで明かされるかもし
れないので
Mizushima :- In that Jupiter exploration ship 80 years prior, we can’t really tell who’s the first Haro and there’s nothing to prove it. On top of it, that’s a really long time back. But when you think about when in CB, the Orange Haro had a lot of phrase for “Brothers” and it refers to the Purple one as “Brotherd” and that perhaps says that the Purple one was the older Haro, which I say made clear in second season.
-ティエリアは人間なんですか?
-Is Tieria a human
水島:ナイショです
Mizushima :- That’s a secret
-人間じゃないとしたら何者?
Then what is him ?
水島:ナイショです
Mizushima :- That’s a secret
-そういうと返ってアヤシイ
There’s really something going on basing on your replies
水島:ナイショです
Mizushima :- That’s a secret
男なの?女なの?
-At least tell us his gender.
水島:ナイショです。だからね。この人が何者なのかも、セカンドにかかっ
てくる
ことなんでもうちょっと楽しみに待っててよ
Mizushima :- That’s a secret. In regrads to what and who he really is, wait for the second season.
・マネキン大佐も戦術予報士。
Colonel Mannequin is a Strategic Forecaster. (i.e. Sumeragi)
・ロックオンによく似た人物のなぞは第二期でやる。
あの墓場にいたのが「どちらがロックオン」かも含めて。
The mystery of the character who looks like Lockon will be solved in the second season. It asks “Which one is Lockon” regarding the graveyard scene.
・ティエリアのなぞ(人間なのか・性別は?)は第二期でやる。
Tieria’s mysteries (human or not/which gender) will be solved in the second season.
・ティエリアのロックオンへの思いも第二期で明かされる…かも。
Tieria’s feelings for Lockon will be revealed in the second season… Perhaps.
・リジェネのことはまだ秘密。でもあれが第二期を象徴している感じ。
第二期は新しいキャラを加えつつ、今までのキャラのドラマが濃くなる。
※ルイスとリジェネが乗っていたのはエレベーター。
The matter of Regene is still a secret. However, it is felt that Regene is a symbol of the second season. By adding new characters in the second season, the current characters’ drama thickens.
Note: The place Louise and Regene were at was an elevator.
・マリナは刹那の運命の人。
Marina is Setsuna’s fated person.
・ロックオンは死にました。グラハムも死にました。
(※はぐらかし放題。死体描写のないキャラの生死はあてにならんなぁ)
Lockon is dead. Graham is also dead.
・紫ハロの秘密も第二期で明かされるかも。
The secret of the purple Haro will probably be revealed in the second season.
第一期はもっと前半に詰め込む作業が出来ていたらと反省している。
もっと加速感が出せればよかった。
The Staff have reflected upon the pace of the first half of the first season. And will hasten things up.
・物語の根本は変わらない。痛みからは逃げるわけにいかない。
戦争ものなのにみんなハッピーはいやでしょ?
There will not be much changes upon the story. And there will not be deflection to the dark and painful things.
After all no body will be happy In a war, right ?
残った謎の解説で「絹江が追っていたイオリアの秘密は
意外なことにリボンズにたどり着きそうになってきた」とあり
The rest of the mysteries about what “Kinue was searching on Aeolia will be accidently found on Ribbon”.
・第二期は地球連邦ができているが全ての国が参加したわけじゃない。
そこがミソ。沙慈のドラマもより展開していく。
In the 2nd season, not every nations in the world bears the intention on joining the EF. And from there, the drama of Saji will developed
最終回でルイスが着ていたのが地球連邦軍の制服。
Louise wears the colours of EF in the final episode.
[水島監督インタビューの一部] [ A part of Mizushima interview ] ■Commentary in PASH(simplicity) / ※PASH is the magazine for female. ・Setsuna’s shout ・Sacrifice of Lockon ・Allelujah & Hallelujah ・Tieria’s vindictiveness
・「00」ではガンダムが正義の味方ではない、というのを貫こうと思っていた。
・なんだかんだ言って、CBの武力介入もまたテロリスト集団のテロ行為には違いない。
・「咎を受ける」ことはファーストシーズンだけでなく、セカンドシーズンでも一つの軸
・00は刹那と沙慈のダブル主人公のつもりでいる。
・ルイスは被害者と逆の立場に身を置くようになる。
・(セカンドシーズンに)刹那は出ます。4年後なので20歳になっているかな。そうな
・I tried to carry out the idea that “Gundam isn’t a champion of justice”.
・After all, CB’s intervention by military power was a terrorism. Therefore, they will need to compensate the world.
・”Be brame for”… This will become one centering not only the first season but also the second season.
・Setsuna and Saji are double hero in this story.
・Louis will become the reverse position to the injured party.
・Setsuna will appear in second season. He will be 20 years old, and grow taller.
[ character’s generalization / theme:love and sorrow]
―He carried through his convictions without being discouraged by adversity.
When everybody worried, only he didn’t hesitate and faced the enemy.
His straight spirit and innocent are true strength.
And, Alehandro’s ambition was broken to pieces by Setsuna’s strength.
―All of him started from “I am Gundam”, and ended in “I am Gundam”.
Love to Gundam is more greatly than average Gundam Otaku! Because “I am Gundam”!
―He was usually an adult attitude. However, he had his own way in the very end.
He fighted for his belief that it didn’t concede.
Beyond any doubt, this is true “man among men’s love” to men!
―The goal of Setsna was same as Lockon’s.
Before his noticing it, Setsuna and Lockon were true companion(comrade).
―To tell the truth, Hallelujah might have worried about the Aallelujah.
There was certainly love between them.
―Mali(Marie?) seems to be a very important person for Allelujah.
We want that Mari’s truth revealed in the second season…
―Tieria’s fight was vindictive, because he wanted to revenge Lockon.
Is it love to the companion…? Was his awkward feeling rewarding?
He alone know their answer.
―Tieria said “I can go to the ~ Lockon…” last.
If Lockon witnessed Tieria’s such state, he would smile(or laugh) as he would say “Ba-ka”, and banter Tieria.
On this scene at the ending of episode 25, it's obvious that the person on the left is Louise as there's a cross-shaped hair clip on her hair. But, who's the person on the right? In the credits, the character is listed as Regene Rejetta.

Regene and Tieria don't seem to share the same hair style, but their hair and eye colors as well as facial appearances and even glasses are almost the same.
Keep in mind that the shot for Regene and Louise took place 4 years later, and Tieria should likely have a more mature appearance than he/she was 4 years earlier...
... which makes me wonder about these possibilities:
Either:
(a) Presumed that Tieria is a cyborg, he may have similar capability as Virtue/Nadleeh (which means ‘Two-Spirit’): “he” has a female “spirit” living inside such that he can “morph” into a person with feminine appearance (for him to infilterate into the Earth Federation?) or vice versa.
or
(b) Regene is Tieria’s twin sister?? (The following pic is a fan art.)
or
(c) Other possibilities??????????
Wow, what a great finish in the last episode! Two awesome fight scenes between Alejandro vs. Setsuna and Graham vs. Setsuna.
Alejandro's mobile armor is so ugly that Setsuna decided to cut it open...
Turned out that inside that ugly mobile armor there's a mobile suit, which is just as ugly.
One lesson he and all the bad guys should learn... never laugh out loud at your opponent too early.
Go GN Sword! Aeolia Schenberg knew that not all the Gundam Meisters aren't cyborgs who can break the codes for the GN Shields, so he had planned for the possibility of Exia fighting against Gundam or GN-powered mobile suits.
Libbons' last words to the Gold Member: "You arrogant idiot. I'm taking over. Have a nice day."
When Alejandro's mobile suit was destroyed, Exia stood right in front of "the cloud"... A classic Anime moment ;)
As indicated in the ending credit, Alejandro's death was confirmed. (松本保典 did the voiceover)
GN Drive... We could finally get to see the actual GN Drive as Tieria released the one from Nadleeh. Can I have something like this in my car?
Four Years Later...
Patrick... He is doing ok, as he was seen saluting right behind Kathy and Sergei.
Libbons... He's taking over, and there were 5 more (cyborgs too?) look just like him. Imagine all 6 of them can pilot mobile suits and can hack into CB system. Since I knew about the "special capabilities" of Tieria, Libbons and Nena, I often thought about some day there will be a showdown between these cyborg type of beings. Has anyone noticed the backgounds (circled in red below) when he was right next to Aeolia Schenberg and when he was with his gang? Looks like they were still in that moon base where VEDA is located at.
Graham... Mr. Char Aznable look alike! Writers just like about a guy wearing a mask, don't they?
Al Ali Sarshes... Sadly, he is not going away.
Tieria... Looks like he has infiltrated into the Earth Federation as he appeared to be wearing the same uniform as Graham and Sergei et al. (source)
Although Tieria was last seen with Louise, I don't think that he's involved with her. It looks like that they were in an elevator or something. Here's my guess: Believe it or not, Saji is still Setuna's neighbor... Louise went to visit Saji but he wasn't in his place (as he was working in space), and coincidentally Tieria went to see Setuna and ended up with Louise in the same elevator as he left Setuna's place.
Ian, Wang Liu Mei and Hong Long... How can the Gundam Meisters and CBs survive without Ian's fast repairs to the Gundams? I always think that he is one of the under-appreciated characters. It's good to see him back. It will be interesting to see Wang Liu Mei and Hong Long pilot their mobile suits.
Nena... Was she hacking to the CB system to eavesdrop their conversations (as her eyes turned bright yellow)? Or has she joined the Sumeragi's CB team? (With her previous childish and irresponsible attack that upset Setuna and other Gundam Meisters, I wonder how she can fit in Sumeragi's team.)
0 and 00 Gundam... Finally we can see 0 (again, which really looks like the first RX-78-2) and 00 Gundams.
00 appeared to be Exia upgrade with a new head. Found this mentioned in a forum.
Setsuna... Is this how Setsuna going to look like 4 years later? (Source)
What a great finish! I'm looking forward to the next season to see how it turns out. This is a fantastic series. I consider Gundam 00 to be in the very top of my list of favorite Gundam series.
Oh, boy. I was left alone in Dynames cockpit right before the battle began ...
This is one of most ugliest mobile armors I've ever seen ... no data :(
This reminds me of those that my 0079 big brother had told me about ...
This thing has 7 GN Drives? Couldn't see if they're all fake or real.
Mr. Corner is the new "Gold Member". Where's Libbons? (I'm sure that he has a mobile armor somewhere.)
This reminds me of those giant spaceships in "Independence Day". Can someone please knock out the code and get rid of the shield?
Tieria, not a good idea to switch to Nadleeh in this battle. I thought Nadleeh's hair can be some sort of weapon, but it turned out it isn't the case :(
Apparently Ptolemaios was equipped with beam weapons, then why didn't it shoot back to Alejandro’s mobile armor earlier?
This is a surprise... I've no data about Lichtendahl, who is actually a cyborg?!
Long Live Lichtendahl and Christina!
Can someone please rescue the remaining real GN Drive from Dynames and me?
(Source: AnimeSuki Forum)
1) The Throne’s red GN Drive was the first GN Drives CB produced, but the red GN particles they produce is bad for human, and the operating condition isn’t always stable, hence they create the TD Blanket that basically filter out the bad stuff, so the GN Drive is more stable and the particles are not harmful to humans. TD Blanket takes mass resource and special environment (Jupiter?) to produce. Supposedly, if the GN Drive keep on emitting the red GN particles, eventually it will “break” the GN Drive (coming from the CB founder).
2) There was an internal break in CB, as they were split as to whether they should use the “fake” GN drives while the main CB group want only the “good” GN Drive to exist. There was a “revolution/revolt” around 80 years ago, the main manufacturing facilities were moved/destroyed, some of the other groups were killed, along with the “living CPUs”. However, some data remains left behind.
3) However, TD blanket has a limit on how much it can filter, so when the GN Drive produced too much, it will start to go “Berserk” and release a lot of red GN particles. This can be used as a weapon, and when the MS is in this mode, it is called TRANS-AM. Weapons and movement are powered several times in this mode.
4) Since the red GN particles is bad for the pilot, this mode cannot be used in normal operation. Only special weapons that require a lot of GN particles like GN ARMS can use it. The TRANS-AM mode can only be unlocked by the living CPU directly control/controlled(?) by VEDA.
It's sad to see Lockon go. Apparently, from the cast changes shown at the end of the last and this episodes (Lockon is voiced by Shin-ichiro Miki 三木眞一郎), those pessimistic writers who tend to be more interested in creating more tragedies and making the stories darker have indicated the departure of this great character.
In episode 21, why didn't Lockon use the two beam sabers that were equipped with Dynames to block the attack from Patrick's GN-X beam saber?
Why didn't Setuna go all the way to get rid of Ali Al Sarshes once and for all when Exia's Trans-Am system was activated at the end of the last episode?
Why was Ali Al Sarshes able to find some spare parts of the Zwei's Fangs when he was onboard with Sergei in the UN transport ship?
Why were Setuna and Lasse so far behind to reach to Ptolemaios, whereas Ali Al Sarshes could get there to do the attack sooner? Wasn't the GN Arms equipped with another "green" GN Drive which is "Trans-Am system capable"?
Why wasn't Dynames' Trans-Am system activated at all in this entire episode?
Why didn't Lockon take the shot at Ali Al Sarshes when he could shoot him from behind?
