Holla is a main character in MyStreet: When Angels Fall.
Holla is an ancient monk, guarding something from the guardian forces. In the episode Don't Disobey Me he appears for the first time behind a protective barrier sealing his room the only the links of Michael can pass through.
Being a man in 60s or 70s he has white hair and a white beard and mustache. He has a white cloak with wrapping on both his arms, he has grey blueish jeans with boots.