Havok

Survived a plane crash, adopted separately from his brother
Powers first manifested when he accidentally incinerated a bully as a teen
Mr. Sinister placed genetic locks on his power, forgot the incident as a side effect
Captured & experimented on, powers resurfaced due to the stress of the ordeal
Rescued by the X-men, joined their team, reunited with his brother
Given a costume that helped him regulate his powers, eventually gained full control
Joined the Pentagon-sponsored mutant team X-Factor, later returned to the X-Men