Ace Telcholine
Every super team needs a strong guy, and the Brain City heroes have Ace Telcholine. He works hard at the Straight ‘Em Depot, flexing muscles by sending trains of muscle traffic down the long tracks into the body. When Dopa blusters into a fight, it's usually Ace's fists which will end it.
He's also the nerd of the group, spending his free time studying at the Hippo Campus, and he's always ready with some obscure fact about different parts of the city. The mystical golden amulet around his neck can capture the essence of a memory or idea.
The chemical acetlycholine was the first neurotransmitter ever identified by science. It maintains sensory attention and triggers muscle contractions. Its role in long-term memory formation is mysterious, which is something that would have been explored more over the course of later stories.