HG WFM #09 MSJ-121 Demi Trainer

(1 customer review)

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The MSJ-121 Demi Trainer is the latest iteration of the Demi Series Training Mobile Suit developed by Burion for use within the Asticassia School of Technology. The MSJ-121 Demi Trainer is a purposefully barebones Mobile Suit designed without any combat equipment found in standard Mobile Suits, granting it incredible maneuverability. The lack of excessive components also made the MSJ-121 Demi Trainer the perfect choice for mechanical department students to modify and customize to their liking. The MSJ-121 Demi Trainer is easily the most popular Mobile Suit at Asticassia School of Technology, favored for its easy handling and versatility.

Included alongside the HG Demi Trainer for accessories:

  • Beam Gun
  • Shield
  • Saber Stick
  • Staff Antenna


The HG Demi Trainer borrows most of its construction from the previously released HG WFM #06 MSJ-105CC Chuchu’s Demi Trainer, showcasing the in-universe lineage that connects these two Mobile Suits. This model features double-jointed knees and swiveling thighs, providing a wide range of motion to create dynamic poses. The HG Demi Trainer’s polycap-free construction ensures the model will hold a solid pose for years to come! Builders can easily connect the HG Demi Trainer to their choice of Action Base using the 3mm attachment point built into the model’s waist. The HG Demi Trainer includes a small sheet of foil stickers to help builders customize their model right out of the box!

Weapons and Other Notable Attributes 

The HG Demi Trainer includes a standard Beam Gun as its primary armament. This compact weapon fires low-output projectiles and features a small magazine in compliance with Asticasssia School of Technology Regulations. The forearm-mounted Shield included with the HG Demi Trainer will provide ample protection against incoming fire. The HG Demi Trainer also features the Saber Stick, a training weapon used in close-quarters engagements. Builders can attach this weapon to the Mobile Suit’s waist or backpack when not equipped. The HG Demi Trainer includes a Staff Antenna used to determine the winner when dueling.

This kit includes:

3 Runners total (A, B, C)
Total Piece Count – 88 Pieces
Foil Stickers
Materials – PS
English & Japanese Instructions

Additional Fun information

Pilot(s): Reiko Hamlet
Unit Type: Mass Production Training Mobile Suit
Model number: MSJ-121
Code name: Demi Trainer
Overall Height: 16.2m(53.1ft)
Manufacturer: Burion

Scale: 1/144
Grade: High Grade
Completed Model Height:
Original Release Date: Dec 2022
Gundam Series: Mobile Suit Gundam – the Witch from Mercury
Mechanical Designer: Kanetake Ebikawa

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SKU: 4573102633569 Categories: , ,


By implementing the technique of Top Coating, you can do a great deal to help preserve the longevity of your models. This process will protect the original plastic of your model kit and prepare it for any additional modeling techniques to follow.

You can drastically improve your results by making the details pop on the HG WFM #09 MSJ-121 Demi Trainer with Panel Lining. The simplest solution for this is Gundam Markers or Tamiya Panel Line Fluid. Making your own panel wash is always a great option too! It is always recommended to Topcoat with clear gloss beforehand, as some of the products commonly used for Panel Lining will degrade the untreated plastics over time.

Another way to keep adding detail is by applying Stickers/Marking DecalsTop Coating before application will help decals stick to the surface much better. Using Top Coat after application will help hide the seams on traditional sticker decals as well as waterslides. This additional step will also keep them from peeling over time. Using Decals is a great way to add an even greater level of detail to your scale models.

General Safety Warning:

Suitable Age: 8+

Assembly required. Snap together, no glue needed.

Products shown in photos may have been professionally painted or computer rendered images. They may differ from the actual product.

WARNING: CHOKING HAZARD, Small parts. Not for children under 3 yrs.

1 review for HG WFM #09 MSJ-121 Demi Trainer

  1. bongdal (verified owner)

    Cute and solid kit

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