If you're a lightning main, Kakashi is an excellent choice for your line up before you hit 50/55. After that, you might wanna switch to Sasuke 3 stars for better buff, also with the summoning pets you gonna get at level 55, chasing combo without Kakashi won't be a problem.

Sasuke has paralyses and he can ignite up to 2 targets or 3 if you're lucky.