The ending is supposed to be ambiguous; they put in enough to build a theory of him surviving but don't confirm it so his fate can be whatever you want it to be- kind of like the ending to FF7 before Enix ate Square and told them to fuck it over with over 9000 sequels and spinoffs.
Suzaku being immortal is a definite no, there's no evidence of him attaining that power.
Xing Ke is most likely dead, but I was kind of sad that they didn't let us know that through anything other than him not being in the photos from after the end (ie the wedding photo.) I was at least expecting a shot of Tianzi standing over his grave, maybe they'll do like they did with HiME and have that in an extended version of the ending montage for the DVD/Blu-ray version.
CC's real name was probably going to be important in the original plot outline, but then its significance got cut in later rewrites. I suspect that the whole thing with CC's past, Ragnarok, and Marianne's death was supposed to be very different (though you can tell from the last Mao episode that her goal of getting rid of her immortality was there from the start) but then they realized that they couldn't fit it all in properly so they had to re-do it within the framework of the existing hints they had dropped in season 1 (and you can kinda tell- they explained how Marianne could talk to CC telepathically, but that explanation doesn't work for how Charles could have been talking to Clovis at the start of episode 6.)
More than likely in CC's past version 1.0 she was some famous historical figure (a lot of people guessed Joan of Arc,) which would explain why hiding her name was important.
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Suzaku being immortal is a definite no, there's no evidence of him attaining that power.
Xing Ke is most likely dead, but I was kind of sad that they didn't let us know that through anything other than him not being in the photos from after the end (ie the wedding photo.) I was at least expecting a shot of Tianzi standing over his grave, maybe they'll do like they did with HiME and have that in an extended version of the ending montage for the DVD/Blu-ray version.
CC's real name was probably going to be important in the original plot outline, but then its significance got cut in later rewrites. I suspect that the whole thing with CC's past, Ragnarok, and Marianne's death was supposed to be very different (though you can tell from the last Mao episode that her goal of getting rid of her immortality was there from the start) but then they realized that they couldn't fit it all in properly so they had to re-do it within the framework of the existing hints they had dropped in season 1 (and you can kinda tell- they explained how Marianne could talk to CC telepathically, but that explanation doesn't work for how Charles could have been talking to Clovis at the start of episode 6.)
More than likely in CC's past version 1.0 she was some famous historical figure (a lot of people guessed Joan of Arc,) which would explain why hiding her name was important.