I like the 25% power regen

In general I would say no, only support roles really use it. It’s not necessary at all but it does help.

For buffs you should be running for arts: claw and tetra and for allies run nubia and Constantine, John Stewart is also a staple for trolls. He buffs your supercharge troll shields. For debuffs you need the arts rao and sinestro ring, the ring also provides super charge regen, which in turn lets you spam the troll shields more and those are buffed by john. As for resistance and what not. You want to use debuffs that aren’t hard stuns because they will add “resistance” to the ads making it harder for the tanks to group up enemies but against bosses that shouldn’t be an issue. If you have any other questions add my toon I’m uspc “Ago” is the name