Conversation so far:
who were some recurring characters on pinky and the brain?
Merlin, H.G.
Wells, and Ivan Pavlov.
anyone else?
Snowball the hamster.
who was on there most often?
CANNOTANSWER.
were there other recurring characters?
Pharfignewton (voiced by Frank Welker) is a racing mare, with whom Pinky falls in love.

Question: are there any other relationships?
Self-contained rewrite: Besides Pinky and Pharfignewton ,are there any other relationships on Pinky and the Brain?