Once you change class, if you wait 24 hours you can change back. You are able to unlock each class, and the purpose of changing classes, is basically just to setup teams that will match and are better then your previous one.

It depends mostly on which ninjas you have already and what kind of team you can build to match certain main character. If you take a look at posts in Strategy section- there's many suggestions of which main goes well together with this team or another and in which situations. You c*so post screenshots of ninjas you have, summons etc and I'm sure people here will help you to choose best strategy.
Also, as mentioned above- you can switch main again after 24h, so don't worry- change mains, try out which goes best with your style and have fun :D

My power went down when switching class

Can someone help me get it back to normal state

was:19456

now: 19140

HELP

It'll do that depending on your mood. Lots of people who are in an extreme bind for power switch to Azure Fang, or Water Main, to gain a little quick power. I've found that Water Main gets most power. Water>Lightning>Fire>Wind>Earth; in that order is often the highest power, to lowest. I hope this helps.

how do u change keybinds help me

I'm at level 80 right now, my power is like around 25000, I'm using the lightning main and I'm currently struggling. Can anyone help me how to make my power increase and what's the best main for f2p players?

*also i need to increase my initiative

But i changed mine and i love the new one so can i keep the new one or do i have to change it back after 24 hours

you can keep your new one

that dosent means that if 24hrs had passed then youll need to switch mains

you can switch 2 times per day. to switch again, youll need to wait for tommorow

hope this helps