Conversation so far:
Who is Nathan?
Nathan Explosion is the frontman, lead vocalist.
How long was he with the band?
first episode.
What important role did he play in the story?
Nathan is slightly more sensible than the rest of the band, and a great deal more emotionally stable.
Does he leave the band?
CANNOTANSWER.

Question: Is there an example of his emotional stablity?
Self-contained rewrite: Is there an example of Nathan's emotional stability?