Sky, Zack, Anarel

Imagine it like "Avatar: Aang the last Airbender" without Aang. The Fire nation has started war. Sky (Air element, on the very left) is a Prince who fights as Samurai. Zack (Water element, in the middle) is a Knight. Anarel (Earth element, on the very right) is a Ninja. They all found each other to fight against the fire nation. They came to your kingdom (be anyone, anything) to ask the first *your element*-bender they see to join them.