If you could add one ability to your favorite character what would it be?

i know this would never happen obviously but i love Mei so much but her ult is one of the easier to avoid in game. Even if you get caught directly in the middle of it you still have the ability to get out of it in time before the freeze. Now this probably would make her super irritating to deal with but i wish at the end of her ult the otter layer of her ice dome creates ice walls that traps people inside and does a small amount of damage if not destroyed.

TLDR i love mei but her ult is so meh lol