The harbor of Citadel Island has a ticket office, a house that belongs to Mr. Paul, and a dock for the ferry.
The gates are guarded by a yellow Groboclone who initially does not attack Twinsen. Killing him simply leaves behind his key.
He attends the counter and sells tickets. When he sees Twinsen he calls a green Groboclone.
In LBA he is not named. A sailor Grobo who looks like him sits outside the warehouse and asks Twinen to stack some crates in a sokoban-like puzzle. As a reward he offers him a Ferry Ticket. He also tells Twinsen that he saw Zoe taking to another island.