Suicidal MC

ML plans to commit suicide for the whole story and eventually tries to

FL eventually tries to commit suicide (pretty sure she has contemplated it a lot before that as well)

ML committed suicide but was revived

FL is terminally ill but has accepted it and doesn't care anymore

FL committed suicide in her previous life

ML contemplates committing suicide

ML is actively trying to (indirectly) commit suicide

FL (trans woman) eventually tries to commit suicide

The Regressor’s Personality Training
(novel only)

ML knows he's slowly dying but doesn't care

Runaway Esper
(novel only)

ML has accepted the fact that he's going to die but doesn't care anymore (I think at one point he does try or simply gives up on living, don't remember)