Kiddy is Marshall's long lost brother. He is a Dalmation like Marshall, but much taller with a weird scar on his face. Before Marshall was born, Kiddy was at a picnic with his parents (missing). His mother was pregnant with Marshall and was going to be born soon. Kiddy sadly wandered off on his own and got lost. He was never found, but he is still very much alive and searching for his younger brother until The Coven Returns Part 6 where Kiddy finds Marshall in an iceblock.
Kiddy is mentioned to Marshall in CLAW Patrol Part 3. Kiddy wears a cloak with a fire symbol.
Kiddy is in Rainbow Power Part 3 and The Coven Returns Part 6.