Topper is the leader of the Broodals. He is squat and round and wears a green suit and yellow bow tie, as well as a green top hat with a spiked ring. Under his hat is a small purple pompadour. Like the other Broodals, he is found in Super Mario Odyssey, specifically in the Cap Kingdom. In battle, Topper stacks two copies of his hat atop his regular one before skipping towards Mario. Mario must knock off his hats using Cappy to damage him; once knocked off, the hat will slide around spinning like a Koopa Shell, and can be hit for one heart each. He also has an attack where he spins along the ground level with the hats on his head. This attack can make him dizzy, giving Mario a good opportunity to strike. Once all the hats are removed, Topper will be stunned, and Mario must attack the top of his head. After this, Topper will hide in one of his hats, and all three will bounce around like shells. At this point, Mario must hit the hat he is in to stop him, with the other hats again providing hearts. From here, the attack pattern starts over, with the exception that Topper now panics and runs instead of sitting stunned when his head is exposed. After he is hit at this point, Topper is defeated and falls to the ground in a daze.
He is later fought again in Bowser's Kingdom. In this fight, he uses several hats instead of just two, runs away in panic when all the hats are knocked off, and must be stomped three times. The final fight is at the Rabbit Ridge tower at Dark Side. He addresses Mario by stating that, even though Mario stopped Bowser from marrying Peach, he still has to deal with them. His strategy is the same as in Bowser's Kingdom.