They r trying to make each main unique without making one glaringly op. Thus the difference.

Fire main has secret jutsu user

Wind main has senjutsu user

Lighting main has anbu style

Water main as medical ninja.

Earth main.. erm erm idk muscles lol?

Also we already have summons as chases.

Ehh, for characteristics that need activation/setting it's stated in their talent/skill

For summons, I forgot what lvl it is unlock.

These things r basics though, if your confused better try chatting someone in game or on discord.

I care more earth main, they should add "throw a tiny rock" skill to earth main.

It should be op enough to one shot a ninja.