Conversation so far:
what special powers did Kevin Sydney have?
Kevin Sydney is a mutant metamorph with the ability to alter his physical appearance and voice at will to resemble that of any person he chooses.
What did Kevin Sydney do with his powers?
He acted as the Mutant Master's second-in-command in an effort to trigger World War III
Did Kevin fight anyone using his powers?
Changeling, masquerading as Professor X, led the X-Men's efforts to defeat the Subterranean Grotesk

Question: What else can you tell me of interest
Self-contained rewrite: What else can you tell of interest about Kevin Sydney besides his powers