He has access to a huge amount of information and can accomplish amazing feats. He can build hard light constructs that are indistinguishable from humans, can perform many things simultaneously (holding multiple conversations at once, etc) and can answer questions about many topics. For example, when Selda wants to know if she could revert to her disabled youthful state, Rick is able to answer immediately.
He is totally obedient to Selda. When she asks him to erase a portion of his own memory, he does so without hesitation.