Cameo Characters are very, very, very, small characters. They usually only appear in 1-3 chapters, and in very little scenes.
They are like the small characters, some who don't even get names.
“"Come on, guys it's just a glowy red dot." - Somjo speaking about a Rage Ghost Somjo was a...Somjo
“Wallo Wango was a very minor character who served aboard the Green Runner. He didn't appear in...Wallo Wango