You need to wish on the character banners. Currently the banner is eula but is going to be Klee next. If you want to get the best chance of getting him wait until his banner comes back. If you don’t want to wait then wish on the standard banner, when you do this you won’t get 50/50 with eula (Klee in the future) and will probably have a better chance at getting him. Still I would wait until he comes back. Good luck traveler!