The C-Pen is a giant creature that assist the Alliance and hostile to Skibidi Toilets. C-pen is part of the Pencilmen's giant because the member of Dom Studio has said it. Furthermore, He is not a titan, and he is much smaller compared to Titan Drillman's first appearance as seen in episode 28 in bloopers and has been confirmed that he is just a type of agent instead of a titan.
Credits:DOM Studio (The creator of the Skibdi Toilet Multiverse series on YouTube)
SIZE:Large
CAN TALK
Have Minigun

