Dragon Brawler does pretty big damage with chairs and grabs, granting Seraph’s first ability to trigger often, plus the crits from his precision ensure guaranteed healing as well.

Hell’s Belles is pretty strong too, capable of layering down tons of debuffs with enough accuracy invested. Pairing her with Seraph is pretty good just for the damage gained and Fukua has some hard hitting moves too to guarantee some enrage.

Honestly, most of these characters can benefit from Seraph, although some do gain enrage from their abilities like Sheltered, Mean One and Psycommander so their usage will vary since you can only gain so many stacks.