Gears, with JVS content.
- Both horizontal and vertical.
- Perhaps a 3x1x3 and a 5x1x5.
- A looping sound effect for extra mechanicalness.
- The hitbox would be slightly smaller than the model, so gears could pass over each other and look attached.
- Looping animation which is just rotation. Easy to make.
That is all.
Burying this thread in stuffty suggestions is a crime. Stop it. I don't like your suggestions, you parasite.