Stef

The girl who Mordecai ended up marrying in the years following the final battle. They met while they were both showing off their respective artwork at a museum and most likely started dating after that day. Not much is known about her except that she is artist.

(https://www.reddit.com/r/regularshow/comments/5oszo6/we_are_matt_price_head_writer_and_calvin_wong/#bottom-comments)

- On Reddit, Story writer Matt Price confirms they never really came up with a name for her, but said that since J. G. Quintel loves the Goonies that her name would be Stef.