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| DEBUT | 1989 |
| PATTERN | Hot Pink |
Mary-Biff is Biff's baby daughter who appears in Sesame Street Episode 2608. She is revealed as one of Biff's four children, and bears a family resemblance to her father (mainly through the prominent nose).
Biff offers child-rearing advice to Luis (mainly teaching counting and the alphabet), and Maria brings back Mary-Biff, so her dad can demonstrate his third piece of advice: showing that you love your kids.
She is the cousin of Roxie Marie, either by blood or by marriage.