The Servbot mask is a novelty mask and weapon in Dead Rising. This mask is clearly based on a Servbot: a character from another Capcom series, "Mega Man Legends". It functions in the same way the other masks do, by swinging the mask or placing it on the head of a zombie.
The mask makes an appearance in Tatsunoko vs. Capcom: Ultimate All Stars as one of Frank's Hyper Combos, where he shoves the mask on his opponent and hurls them into a crowd of Zombies before using the Face Crusher move on them.
It also has an appearance in Lost Planet 2 as a unlockable head item, it is given to players who have a Dead Rising save on their Xbox 360 or while having a Lost Planet save on their PS3.
It also looks like the basic head of the popular LEGO minifigures.