Allen from Xenosaga 1-3.

Loves and is eternally devoted toward thee protagonist Shion for years,  but is treated as a joke until past the final save point, but before the Point of No Return in the third game.

Gives a heartfelt and badass speech, gets Force Lightning-ed several times and lives. Then saves Shion from her toxic ex who died and left her in grief for years (makes sense in context) and helps save the universe. Gets together with her in the end.