This is Jalo, the eldest of the MacKain siblings, which Claw is the youngest of.

Jalo was given to an adoption agentacy at a young age. He became a mercenary after growing up. Claw managed to track him down after he learned of his two eldest siblings, Jalo and Mika.

And yes, he's a liger, despite Claw and Crystal appears full lion and Long appears full black tiger.