Bogie is Honoka’s partner.  He’s an A.I. unit that acts as Honoka’s guide, guardian, and friend.  The actual casing he resides in isn’t very large, but he’s usually fixed into Honoka’s tank to act as its pilot.

He has a very straightforward personality and is often strict with Honoka, especially when it comes to her safety.  He seems to nag a bit when she doesn’t wake up on time, or follow a specific course of action… but perhaps that’s to be expected of a computer.  

Regardless, Bogie cares about Honoka a great deal.

(Source: RightStuf)