According to Jury Rigging, it is stated that there are rumors of his true identity of being a vampire. RukatuKDH came up with the idea.
There was an old rumor when Mad Paintball was updated that Duke could jump. The reason was because in his description, it said he did parkour which relates mainly to jumping & doing flips.
Duke use to be a rifle, but now he got changed into a mini-gunner in the December update.
Duke's original rifle stats were: HP- 140, Speed- 17, max damage- 27-32, Clip Size- 10, fire rate- 2.5 shots/s.
This makes him one of two characters who switched classes from the Christmas Update, the other being Red.
Duke has the highest health recovery of all characters, at -49 being 10, while 50+ Dukes have 10.5 health recovery. Billy has a base health recovery of 2, and heals only 3 of his HP when he does. This means Duke usually gains 11-13 HP every time he heals.