Conversation so far:
Was Comet good or bad?
Comet's appearance was unclear.
What superhero was he with ?
Supergirl.
What powers did he have?
could shape-shift between her human and super-powered forms.
What did Comet look like?
surrounded by an aura of cold.
Who was Comet?
hero with flight and cold-generation powers.

Question: Was he/she a male?
Self-contained rewrite: Was Comet a man or woman?