Thorny

Thorny is a mass-produced machine formerly used by the Engineering Force. Some of its traits shown during the digging operation caught the attention of the staff and it was permitted to be modified into a CUB.
The spikes added during the development process have granted it the ability to defend itself against the enemies and made it look more like how it looks right now.

Thorny was on a terrain exploration mission with the Engineering Force during the trial period after it was modified into a CUB. However, Thorny starts to exhibit strange behaviors after the mission. For example, it would stand on its hind legs and reveal its belly without thorns to people while holding the staff member by their wrist.
"Why is it so clingy? Has it always been like this?"
A hot-tempered Engineering Force Construct always complains like this to the staff members at the scene while cleaning up mud-covered Thorny.

As its name suggests, Thorny weighs extremely heavily when fully expanded.
But it is also surprisingly easy to "pick it up" if you hold Thorny's front paws and push its lower body to its belly.
However, if you pay more attention, you can see that Thorny is always stretching the spikes on its back secretly and stabbing them on the ground to raise its body and ease the load for whoever picks it up.
"...Does it love to be picked up?"
This is the only conclusion the experiment staff could draw when seeing Thorny's shaky front legs.