Blue

Blue is one of the main recurring characters in each of the series, appearing in all 3 seasons of AMR, Algicosathlon, Kart-Race Revolution, and Flag Frenzy.

Physical Appearance
Blue is an actual blue stickfigure without any accessories on his head.

In Algodoo Marble Race
Blue seemed to do kinda bad on Season 1, getting a 7th place on it.

But later on, he got very well on Season 2 and getting a 5th place.

Blue still got a 30th place on Season 3 in Part 3, letting the others continue before.