and how many gorilla characters are there? and which one is the strongest?
The ones that I can think of off the top of my head are: Grodd, Solovar, and the gorillas of gorilla city, Monsieur Mallah, Ultra Humanite (I guess), and Congorilla.
I'm sure there are plenty that I'm missing. I think the answer for most popular and powerful would go to Grodd.