Ripnik is the Master Thief of the Raven Tribe, described as the best thief in Chima. The Ravens have him steal from other tribes when it is more difficult in doing so. He lleads some packs in the Raven Tribe. Ripnik is only an animated character, not a minifigure in Lego sets.
Ripnik is only seen in a few episodes, most considerably in Attack on Eagle Spire (Episode 6). In this episode he steals the wolves' Mother Tooth, which sets up the plot in this episode.