The Generation X comics from marvel are oddly really underrated, considering how they got three prose novels on the side. The characters from those comics haven't really been used as a team outside of the series, instead splitting off which makes it hard to keep up with everyone.
Anarky (before the DC reboot) was also a really interesting character. Then they branded Lonnie as a villain and started treating him like one when writing him. And I don't even know what they're doing with him anymore.