|Given name||Gilliam II|
|Blood Type||Oil (maintenance bot)|
|Height||1'2" (37cm) (maintenance bot)|
|Weight||2.2 pounds (1kg) (maintenance bot)|
|Occupation||Artificial Intelligence System for the Outlaw Star|
|First Anime appearance||"When the Hot Ice Melts"|
|English VA||Peter Spellos|
|Japanese VA||Takaya Hashi|
- "The only answer I have in regards to myself is; that the name I have been granted is Gilliam II, and I that I have been authorized with the maintenance of this vessel."
- —Gilliam II
Gilliam II (ギリアムⅡ, Giriamu Tsu?) is the XGP 15A-II's artificial intelligence system and a major supporting character in the series. Primarily communicating through speakerphones, an interface on the bridge, and a seemingly limitless number of miniature maintenance robots, Gilliam is a constant companion of the crew, and assists them in all areas of the ship’s upkeep – even including the kitchen-duty. Sporting a wryly sarcastic, if soft-spoken and humble, personality, Gilliam has been referred to as an “old man,” and indeed, is almost always engaged in reminding the crew of their personal duties and responsibilities, much as a father figure or a butler might. This often irritates Gene, who would rather sleep late and shirk chores, and Gilliam, as a result, is frequently compelled to confront Gene about his laziness and inadequacy. Gilliam also regularly voices concern over his "future prospects" due to the brash nature of Gene's captaining.
When first activated, Gilliam seems hesitant to allow Hilda, Gene or Jim access to the XGP, noting that a large portion of memory has been deleted from the ship’s databank – no doubt a result of the hacking used to divorce the ship from its previous owners. However, upon being ordered, Gilliam enlists them as the crew, and remains unquestioningly loyal to them and their cause afterwards.
Gilliam takes great pride in the capabilities of the XGP, often proclaiming it to “the fastest, most advanced ship in the galaxy." Gilliam is nevertheless burdened by a programming limitation, which disallows him to question the nature of his existence. A technical safeguard against rebellious and sentient AI, Gilliam is still sentient of the restriction, and so while unable to contemplate his own purpose in life, he can contemplate, and does lament, his inability to ask such a profound question. As such, he greatly empathizes with Melfina’s quest to discover her identity (a task that he could never begin to attempt in regards to his own origin), and is always willing to exert himself to the fullest in her assistance. As much as he combs online databases available to him, however, he is never able to uncover any information that would help her.
As previously stated, Gilliam has a seemingly endless number of tiny maintenance robots to allow him to repair the Outlaw Star. While the majority of these robots are colored blue, Jim Hawking decides to paint one of them pink on a whim, and in subsequent episodes, Gilliam uses this pink robot as a means of speaking face-to-face with the crew more often than with the blue robots.