HGUniversal Century

RX-121-1 Gundam TR-1 [Hazel Custom] with Icarus Unit

A test pilot's fever dream of a flight unit, bolted onto one of the best Hazel Custom builds Bandai has made.

MechaGrade Score

3.9/5

Gundam TR-1 [Hazel Custom] with Icarus Unit · 1/144 · 2026

GradeHG

Scale1/144

Released2026

Runnersn/a

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The verdict

This is a niche P-Bandai kit that earns its price with a genuinely strange, genuinely cool gimmick: a mobile suit that flies on raw thrust instead of transforming.

The base Hazel Custom underneath is a well engineered HG with real shoulder and hip range, and the Icarus backpack adds sliding thermonuclear engines and a flip-up flight mode that actually changes the silhouette. I like it more than I expected to going in.

Best for: AoZ and Titans-era completionists who want the flight-mode gimmick and don't mind P-Bandai-only sourcing

The full review

What it is

This kit is the RX-121-1 Hazel Custom with the Icarus flight backpack strapped on, and the two halves genuinely work together. The Hazel Custom frame underneath has double-jointed arms that bend all the way to the shoulder and hip articulation that holds a wide stance, so the base suit was already a fun build before the Icarus parts show up. The Icarus Unit itself is the reason to want this kit specifically: newly molded thermonuclear rocket engines on the shoulders slide forward and back, the rear armor flips up, and the whole thing reconfigures into a distinct flight pose rather than just sitting there as dead weight on the back. Building it felt less like assembling a suit and more like assembling a concept.

The catch

Bandai leans on clear decal stickers for a lot of the fine color work on this frame, and builders of the base Hazel Custom kit report they don't sit well on curved or angled surfaces, they lift at the edges unless you trim and press them down carefully. Some panels also come out in the wrong molded color and need hand paint (metallic grey, copper, yellow, red) if you want the accents to read correctly out of the box. Torso rotation is limited by the back skirt, the knees are boxed in by the oversized rear leg shaping once the Icarus unit is mounted, and you will not get a full leg split. It is also Premium Bandai exclusive, so no shelf pickup, and at roughly 4,620 yen before shipping it is priced above a standard HG for what is still, mechanically, an HG-level build.

Who it's for

Buy this if you already like the TR-1 line or the Advance of Zeta side story and want the one HG that turns the Hazel Custom into an honest flight pose instead of a static robot. The engineering on the Icarus backpack is clever enough on its own to justify the kit for detail-oriented builders who enjoy fiddly accessory assemblies. Skip it if you want a fast, sticker-free weeknight build, or if you're not willing to source through Premium Bandai. New builders who just want their first solid HG should look at a mainline release instead, this one rewards patience with decals and a willingness to paint a few accents.

The build story

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

The core Hazel Custom build goes together without real complications, gates are placed reasonably and grip is stable enough for weapon handling once assembled. The friction comes later, with the clear decals: they look sharp when they sit flat but curl at the edges on anything but a flat panel, so budget extra time to trim and burnish them rather than slapping them straight from the sheet.

The standout engineering is the Icarus Unit itself. The newly molded thermonuclear rocket engines on the shoulders and the jet engines worked into the legs aren't just static bulk, the shoulder units pull outward and slide, and the front and rear armor sections flip up to recreate the suit's flight mode, with the beam reflector parts articulated between expanded and closed states. That's a real transformation-adjacent gimmick for an HG price point, and it's what makes the added bulk worth carrying once the kit is finished.

Lore & trivia

01The Icarus Unit was conceived within the Titans' aerial combat program as a way to give a variable mobile suit true flight in gravity without transformation or wings, after early aerodynamic wing designs proved too unstable in mobile suit mode and the project pivoted to pure thrust.
02Development data from the TR-1 line, including lessons from the Icarus flight experiments, feeds forward into the later Byarlant, and this HG kit is built to be compatible with the separately sold HGUC Byarlant's arm parts.
03The kit is a Premium Bandai exclusive tied to Mobile Suit Gundam: Advance of Zeta - The Flag of Titans, released in March 2026 at roughly 4,620 yen.