Account Transfer = arena team lost?

Q u o t e:
If I transfer one of my characters onto another account of mine on the same server, will he be kicked out of any arena teams?

In short, Unbearabull, yes, you will be removed from your arena team, should you transfer your character from one account to another; regardless of that character staying on the same realm. As stated above:

your character will not have any arena team affiliation following the transfer. Keep in mind that since your character will be removed from its arena team at the time of transfer, when the arena season concludes, you will not receive an arena title for your participation in the arena team you left behind when you transferred. If the current arena season will be ending soon and you would like to receive the title from your arena participation, you may want to wait for the season to officially conclude prior to transferring off the realm.