No, it's not Casper and it's not a ghost.
Warashi-kun (童くん) is the main character of the Anchor Manga Warashi-kun series of comic strips from the Triggerheart Extension fan corner of the japanese Arcadia magazine. The Friendly Ghost Warashi-kun tells us some funny short stories about the Triggerhearts, and sometimes he gets involved in some situations like meeting Exelica.
Curiosities[]
The character's name comes from the company who created the Shienryu series, Sengeki Striker and Triggerheart Exelica, but for some reason it wasn't used as their mascot.