HGBuild Fighters

GX-999910 Gundam X Jumaoh

A demon king that swings four cannons like a sword and never once asks you to paint it.

MechaGrade Score

3.7/5

Gundam X Jumaoh · 1/144 · 2017

GradeHG

Scale1/144

Released2017

Runnersn/a

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The verdict

I like this kit a lot more than a plain HGBF entry has any right to be liked.

The X Cannon gimmick, four beam cannons on articulated back arms that fold into a menacing X when idle and swing forward into a firing wall when posed, is the reason to own this, and it genuinely works on the shelf. It is not a technical showcase and it will not out-articulate a modern HG, but it is one of the more theatrical weapon systems in the HGBF catalog and it earns its price.

Best for: builders who want a big, weird, purple-and-gold villain suit with a genuinely fun back weapon and don't mind a sticker sheet

The full review

What it is

This is Mao Yasaka's demon-king Gunpla from GM's Counterattack, built up from the Gundam X Maoh with stolen Crossbone tech, and Bandai leaned all the way into the concept. The black, purple, and gold colorway is aggressive without being muddy, the jagged shoulder and shin armor reads as villainous the second it's out of the bag, and the four-cannon X Cannon rig on the back is the star of the show. Folded, it reads as a spiky X-shaped backpack. Swung forward on its articulated mounts, it turns the whole kit into a gun platform pointing every barrel at once. That single gimmick carried my enjoyment of the whole build.

The catch

This is a 2017 HGBF kit and it plays like one. Molded color separation on the smaller beam cannons and face details leans on stickers rather than parts, so straight out of the box some panels look a little flat until you commit to the sticker sheet and seal it with topcoat. Knee and elbow bend is capped around 90 degrees, which is standard for the line but noticeably behind what a modern HG will give you, and the waist rotation is limited by the skirt armor. The X Cannon backpack is also heavy for the frame, so ambitious back-cannon poses need a stand or careful balance or the figure tips.

Who it's for

If you want a Build Fighters villain suit with real shelf presence and a weapon gimmick that isn't just a straight rifle, this is a genuinely fun pick, especially at HG price with no painting required to look good. Skip it if pose range and tight, sticker-free color separation are your main priorities; a modern HG or an RG in the same price range will flex and pose more convincingly. This is a character kit first and an engineering showcase a distant second, and it's honest about that trade the moment you see the cannons swing out.

The build story

What the build is actually like, and the engineering worth knowing about.

Assembly is straightforward HGBF fare, snap-fit with the usual small nub cleanup on the limbs and cannon housings. Nothing about the build is fiddly or frustrating, and the trickiest part is just getting the back-mounted cannon arms seated so they swing freely without popping loose, since that joint carries the most weight in the kit.

The engineering highlight is entirely the X Cannon mechanism: four separately articulated beam cannons on a backpack frame that pivot independently and can be locked into the folded X shape or swung out into an attack spread. Standard HGBF articulation elsewhere (ball-jointed head, hip swing, skirt armor pivots) covers the basics without doing anything special. Accessories are limited to the cannon rig and a pair of beam sabers that the character rarely uses in-universe, so the loadout leans hard on the gimmick rather than a varied arsenal.

Lore & trivia

01The Gundam X Jumaoh belongs to Mao Yasaka in Gundam Build Fighters: GM's Counterattack and is an upgrade of his earlier Gundam X Maoh, built with technology absorbed from his XM-X9999 Crossbone Gundam Maoh.
02Its name plays on 'maoh,' meaning demon king in Japanese, matching its long-range, overwhelming-firepower fighting style.
03The X Cannon backpack carries four beam cannons that can fire simultaneously alongside the smaller body-mounted cannons, a barrage the character uses to cut through anything in its path rather than relying on its rarely-drawn beam sabers.
04It was later reissued through the Premium Bandai channel after its original 2017 release, a sign of lingering demand for a kit that never got a mainstream retail HG counterpart.