Cloud shares his theme with the game - the Main Theme of Final Fantasy VII (that's an orchestrated version - everything else is going to be original 1997 video game music). In particular, the moody passage towards the end transitioning into the triumphant part is associated with the final reveal of his mystery. He even plays it on a piano at one point. Motifs from it appear in some of his other themes:
Who Are You - Cloud's theme for his hallucinatory episodes. Who Am I? - this is literally the music that plays inside his mind, apparently. He wasn't very well at the time. On That Day, Five Years Ago - five years! his brain hurts a lot. Five years. That's all he's got. Interrupted by Fireworks - love theme.
As someone not especially mentally stable continually playing a cool and heroic character, mentioning that it sounds video-gamey and glitchy, a sweeping orchestral score played entirely on bad synths, is very appropriate.
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Who Are You - Cloud's theme for his hallucinatory episodes.
Who Am I? - this is literally the music that plays inside his mind, apparently. He wasn't very well at the time.
On That Day, Five Years Ago - five years! his brain hurts a lot. Five years. That's all he's got.
Interrupted by Fireworks - love theme.
As someone not especially mentally stable continually playing a cool and heroic character, mentioning that it sounds video-gamey and glitchy, a sweeping orchestral score played entirely on bad synths, is very appropriate.