i think you should go for Zarya next, because her raw body strength makes it especially interesting.
would be awesome to see some thick tentacles raping her eye sockets and pulling her legs apart while her arms are already torn off.

also, if you don't mind it, i'd suggest futanari, especially with Zarya, giving her a nice big set of balls and a large cock that's also ripe for tentacle abuse (especially if a tentacle would torture her peehole and dig down to her balls)