DEATH MONTH II: AVALANCHE

[Dean Clayton]

Originally self-styled as ‘the guy who blackmailed California,’ this Greek-born mutant gained international notoriety when he destroyed the Eiffel Tower. Having served numerous incarnations of the Brotherhood of Mutants and having served time in various facilities for super-powered criminals, Avalanche ultimately reformed himself when he opened his own bar in downtown San Francisco. Alas, permanent happiness was to escape him, courtesy of a brainwashing, which led to his self-inflicted death.
https://uncannyxmen.net/characters/avalanche

[EvilMonkeyPope]

Nothing about X-Men Annual 2?
Poor Avalanche deserved more characterization.

[Mesmerizer]

You are right about X-Men Annual #2, I have no idea why I forgot to include that (his reunion with Pyro post-Kuwait). I am adding a reference, thanks for that.
And yes, Avalanche was woefully underdeveloped as a character.