Oisin

Oisin is a character in NumberMustard. He first appeared in Neon's Big Day as the fourth number to be made.

Season 1

 * In Neon's Big Day, a Brandon and Neon add up to make an Orion. That same Orion added with a Neon to create Volcano.
 * In Heated Afternoon, Oisin rushes over to Volcano to play a game with him. He mentions that the rest of the Numberblocks died on the way there. On the way out of the lava biome, Oisin gets burnt and becomes 4 Neons. When Volcano misses his shot in the game, Oisin re-assures him.
 * In Kings and Queens, Oisin tells T.Ree and Volcano about the fact that Queen Enyette is related to royalty.