Marvin is one of Night Ninja's named Ninjalinos. He was first identified in the Season 2 episode "Wolfy Mountain" when Night Ninja revealed his name.
Like the rest of the Ninjalinos, Marvin is very obedient towards Night Ninja's orders. Marvin usually stands out as the clumsy Ninjalino who is less skilled in martial arts and acrobatics than Night Ninja and the other Ninjalinos.
- Sticky Splat: Along with Night Ninja and his Ninjalinos, he is able to use colorful gooey balls known as Sticky Splats to pin down his enemies.
- Martial Arts/Acrobatics: Despite him being the clumsiest and least skilled out of all the Ninjalinos, he is still trained in martial arts and is very fast and agile.
- Ninja Fingers: He also possesses an ability known as "ninja fingers", which gives him the power to move any object of any size just with his fingers.
Marvin is identical to the Ninjazouaves and Ninjalinos, so nothing was different to his appearance.