Knight Pawn
From Sonic Retro
The Knight Pawn is an enemy robot that has his first appearance in Sonic Rush at the Water Palace. They are variations of Egg Pawns, but look like black knights of the medieval age, because they carry themselves with spears and knight helmets.
In Sonic Rush it appears on Water Palace as the main enemy replacing Egg Pawn.
He returns in Sonic Generations at the same stage but more updated, but not changed at all.