is it a rule violation to be on lets say one warrior and one ranger at the same time(training) but diffirent computers i mean one laptop for the warrior and my main computer for my ranger i read the rules says (Playing on multiple characters at the same time)
if a pk would come it would just be harder for me to survive no benefits from it expect the time i skill of course

is consider a banishment offense however i would like to know so if i could train in the future or not.

Yes it would be illegal, I don't remember which thread I read it in though so you'll just have to take my word for it.

You may only play on one character at the same time.