Not a healer mom but

Okay so I happen to be someone who very much likes support classes when it comes to multiplayer RPGs​ and hero shooters. I think they're pretty cool. I am not a big fan of being a healer bot what I love is buffing and debuffing. So now my curiosity is wondering about people's best time playing as a support character within a ttrpg. What system were you using, what was the campaign like, what kind of character you were playing and so on?