Richie is a familiar Billy can hatch from eggs. His egg is purple with stripes. He uses an ice attack where he charges while being encased in ice and creates the illusion that there are three of him, damaging any monster he runs into.
Richie is purple, hence why he emerges from a purple egg. He looks very similar to a seal, except he has sharp spikes on his back. He also wears a red handkerchief, similar to Billy's.