Rail

A member of Lamia created less than 15 years ago. Rail is an explosives specialist with an outspoken hatred of his master and creator Huey. He hero-worships Christopher, who befriended him after a particularly traumatizing experiment.

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Later in 1934, Rail leaves Huey's side after befriending Nice and joining Jacuzzi's gang. He is also revealed to be actually female.

(Source: tvtropes.org)