Mortimer Mango is a mango that is a friend and fellow Christian convert of Bert Banana, and he says he's a scientist like Frylock. He is shown in the episode Bible Fruit, and is voiced by H. Jon Benjamin. He appears as a baseball glove named Mortimer in Soul Quest Overdrive. He also makes a brief cameo in the episode "A PE Christmas" with Bert and Tammy.
Mortimer is a recovering addict who says he hasn't touched cocaine in three years. He tries patiently to calm Bert down after he goes into a liquor-hungry rampage, but eventually tries scoring him some cocaine off Frylock (which fails completely). He presumably is killed along with the other two Bible Fruit when Frylock blows up the house.