Seriously, I'm all familiar with Plan 1055 Belial, though its from "Full Metal Panic!". One thing I'm sure its definitely not in the anime. I must admit that its a really sexy Arm Slave(AS). The Plan-1055 Belial is one of the worlds first 4th-generation Arm Slaves. It is Leonard's personal AS, and he uses it to destroy the ARX-7 Arbalest. It has a really sleek design and can be posed gorgeously with a bow weapon. I would assume that its designed for long-range attack. At close-up, it has a 40mm vulcan which is an interchangeable part.
Somehow, I can't help relating the mecha design with the black version Bunny Suit from the anime "Tiger & Bunny" though they are never related. The toy has a nice chrome silver paint and some gun metal shades. Great articulation from Robot Spirits, just be mindful with the shoulder armorer as it popped off a couple of times when I moved the arms. I don't think the figure hold up very well as its like standing on high heels. Nonetheless, the toy come with a clear stand which helped a lot in posing it.
Figure courtesy of Stanley Lim