He's the tall black one.

Renderman is an add-on for Blockland created by the user chrisbot6, the entity known as Renderman is hostile towards players, and is controlled by AI variables commonly found in bots .

There can be a maximum of 5 Rendermen on a server, Renderman can have their spawn-rates and hostility altered through events. In 2013, a player named "Doom Mantis" proposed a theory stating that Renderman could only manifest when bricks are near, this theory has not been proven, but is likely false.

Original thread renderman and download link here