Rogue. She's not bad, but no one really swears by her. For some reason I really enjoy using her.
Groot- wait he’s Groot tier. Captain America WWII. Very fun.
I'll second OG black panther. I got him as a 6* and his bleed damage is legit. Can't imagine using him outside arena, but it's fun to see red numbers.Rogue doesn't belong here though. She's not aegon or ghost, but she has been a solid utility champ for a long time. Shrugs debuffs, can heal, some power control... Like a mutant Ghost Rider. I used her a ton in 5.1 and 5.2 back in the day. (Edit: and AQ)