Ok, 20 for Sniper, Luminous!Tale!Undyne, and Kv!Edge?
Oh that's an interesting line-up! I assume you're asking for Lustertale!Undyne, Alex, right?
20: What’s a superpower or magical ability that this OC would hate having?
Sniper
Hm... Hard to say.... Sniper is pretty chill with a lot of things, so I think he could make any super power work. I think most element-based super powers probably would be his least favorite, as they wouldn't have much of a use for him!
Lustertale!Undyne
Fire powers probably XD Alex isn't fond of heat.
KV!Edge
Hm... anything too flashy would be an issue I think. Edge's line of work requires subtlety, so he wouldn't want anything that could draw a lot of attention. So fire, electricity, flight(In the event of not having wings that is), stuff like that, which is very obvious wouldn't be his preference. He'd still make it work though, use what he has to his advantage and all that.