Heyo,

First of all, Jinin is a swords ninja, which means lightning main could be one option with him and probably the most effective. His passive is very solid and he'll be stacking for each skill point on him some more attack and ninjutsu, which really makes him to a solid nuke character. One problem with him would be that he'd be very easy to be countered. He can be in team with the following for example:

t's necessary to trigger Jinin's chase at least twice every round, which will give you an additional skill point. The only bad thing here is the luck of root. It basically will buff 3 of your ninjas and not all of them. That's why we got Kakashi there, a small additional protection. Also, you c*e the leech passive as well if you wish. You can combine him with ninjas that basically buff swords man mostly with lightning main.

Here is an option as earth main :

You c*e the double standard here instead as well. The team synergy wise is really okay overall, Sakura gives some good support. Give it a try, I did not play with it a lot, only one or two times to try some random things out before. But overall it's a fun team to play with.

Hope that helps!