Banshee

As an ally of the X-Men, Banshee had countless adventures, joining them when most of the original roster quit. In collaboration with the X-Men, he became the partner of Dr. Moira MacTaggert, reconnected with his lost daughter Siryn, and became a mentor for the next generation of young mutants. Unfortunately, the apparent death of Moira turned him bitter and led him to embrace extremist approaches. Still, in the end, he experienced a noble death, giving his life as a last effort to save an airplane full of innocents