girphan (ishiyumi)
Mecha character from Girls Who Get It, an original Twitter-hosted web series by Ishiyumi.
Resembles the ARX-7 Arbalest from Full Metal Panic!, but with a different head unit.
Girphan is often used as a stand-in for the 'protagonist mecha' in imagined scenarios thought up by the GIRLS who get it, or in model kits worked on by the same.
Becomes an actual sentient character later in the story.