Havok has always been a B-list hero, despite leading teams like X-Factor, the X-Men, and the Avengers Unity Squad. The brother of Cyclops first appeared in the Silver Age and became an on and off member of the X-Men. The Claremont run eventually brought him back to be the resident Summers on the team, and Claremont played up Havok's need to be a hero. This earnestness towards heroism has always partly defined Havok, and it's been his biggest weakness.
Source：https://www.cbr.com/dark-xmen-havok-biggest-weakness/
