From the Haro Mechanics Project, or "HaroPro" for short, comes the Prototype Hello Worker SEED Z'Gok Arms.

It's said to be nicknamed "Seed Mode" because of its appearance.

Usually, I come up with modifications while playing around with the model, but this was a rare case where I bought it with modifications in mind, based on information about the model, such as the fact that there's a Gundam inside the Z'Gok, or that it's partially visible when damaged, and (speculation) that Haro might fit inside, and that it could be separated and combined to become an optional weapon for Haro.

SEED Z'Gok Arms | ケンジャ's Gunpla works