IMS 1/100 V Siren Prominence vs Neptune: Which to Build?
By Dollfie — VOLKS USA, INC. | Published: 2026-11-02
Category: Comparisons
Compare the IMS 1/100 V Siren Prominence and Neptune on height, silhouette, and display impact. See which kit fits your shelf and build goals before you buy.
Quick answer
Choose Prominence if you want a taller, more towering display piece; choose Neptune if you prefer a wider, more compact silhouette that fits tighter shelves. Both are 1/100 IMS plastic kits sculpted by Okiharu Hirai, so the decision comes down to size and shape, not build complexity.
Height and width decide the display
The Prominence stands about 285mm tall and 145mm wide, while the Neptune is about 256mm tall and 160mm wide. That 29mm height difference is noticeable on a shelf, and the Neptune’s extra width means it needs more side clearance. Measure your display space before ordering—neither kit is small.
Same scale, different presence
Both are 1/100 scale, so they share a common size language with other IMS kits. But the Prominence’s taller proportions read as more vertical and imposing, while the Neptune’s wider stance feels more grounded. Neither is better; pick the posture that matches the rest of your collection.
What the shared specs tell you
Both kits are plastic injection kits sculpted by Okiharu Hirai, with prototyping by Hiroshi Ohishi. They are intended for ages 15 and up and have sharp edges, so careful handling is required. The photos show finished samples, meaning paint and finishing are up to you. No option types are listed for either kit, so plan your build around the included parts.
Key trade-offs
- Vertical impact vs shelf fit: Prominence gives you a taller figure; check that your shelf has at least 30cm of clearance above the base. Neptune is shorter but wider, so confirm at least 17cm of side space. Measure both height and width before you commit.
- Silhouette and collection style: If your collection leans toward tall, narrow mecha, Prominence blends in; if you prefer broader, heavier-looking builds, Neptune is the better match. Match the kit’s stance to the kits already on your shelf.
- Build effort and finishing: Both are injection kits with sharp edges and finished-sample photos. Neither includes options, so decide based on size and shape, not on variant parts. Budget time for cleanup and painting regardless of which you choose.
Product facts
- IMS 1/100 V SIREN [PROMINENCE]: Height about 285mm, width 145mm. It is the taller of the two, so it makes a stronger vertical statement but needs more headroom.
![IMS 1/100 V SIREN [PROMINENCE]](https://volksusaeqz.com/api/image-optimizer?src=%2Fuploads%2Fsites%2F4804%2Fimport-1789283531672-490291955.jpg&w=1200&q=85)
IMS 1/100 V SIREN [PROMINENCE] - IMS 1/100 V SIREN [NEPTUNE]: Height about 256mm, width about 160mm. It is shorter but wider, so it suits shelves with limited height but generous depth.
![IMS 1/100 V SIREN [NEPTUNE]](https://volksusaeqz.com/api/image-optimizer?src=%2Fuploads%2Fsites%2F4804%2Fimport-1789283528333-94655748.jpg&w=1200&q=85)
IMS 1/100 V SIREN [NEPTUNE]
Which should you build?
Best for
- Builders with tall display space who want a dramatic vertical centerpiece
- Fans of the Prominence design who prioritize height over width
Not for
- Shelves with limited height clearance
- Builders who prefer a wider, more compact silhouette
![IMS 1/100 V SIREN [PROMINENCE]](https://volksusaeqz.com/api/image-optimizer?src=%2Fuploads%2Fsites%2F4804%2Fimport-1789283531672-490291955.jpg&w=400&q=82)
![IMS 1/100 V SIREN [NEPTUNE]](https://volksusaeqz.com/api/image-optimizer?src=%2Fuploads%2Fsites%2F4804%2Fimport-1789283528333-94655748.jpg&w=400&q=82)