Gaara 4* is good in pvp and in ranked too i am still using him, he is immune to high float, low float etc. he is practically like a earth main. He provides shield to all wind ninjas like naruto, kankuro etc., he also have sand barrier which is good for wind ninjas i guess.
Hinata is a beast when it comes to tanking however she is waste against many ninjas like naruto, gaara and puppet attack.
Suigetsu is better for water main i have seen many water using them at early 60 level and some at 70 still uses him.
Haku will be a good choice for water main and zabuza in early game.
tobi is a must have for everyone because his ignition is quite high.
and you want animal pain as you progress in game she is good with water main.