If i could act, in this scenario id pick someone like Gru or Megamind maybe, so a villain who's not rlly a villain.
Loki on the other hand seems a tad too much the God of Mischief for comfort, i expect him to burn the Timekeepers n the TVA to the ground by the time he's finished with his stint with them on his show. As Thor knew in Ragnarok, you dont trust Loki not to look out for himself. Even with the time shenanigans, especially since the current Loki dint face Surtur/Thanos, so we dont know if he'll turn out the same as in Ragnarok/Infinity War/Endgame.
I'd pick Skurge b4 Loki. He was more my speed/style.