Marker is a green-tipped dry-erase marker with a white body. In the BFGA intro, Marker has a bright blue cap. Though in the former cast for RIBS, she was given a bright red cap. Currently, Marker's cap is bright green.

Personality
Marker is shown to be pretty chill and laid back and likes to run. At some points, she can get really random on what she says. However, it might just be the fact that she is speaking true facts that only geniuses like Albert Einstein could understand.