Many people asked for stealth to be included in the game, so here's a stealth based enemy, the Ninja Robot!
This foe is supposed to be a quick, strong, but largely defenseless foe. There's also a stronger variation that's colored Ocean instead of black.
It's main ability is to become transparent, being harder to spot on the arena, it's upgraded version can basically become invisible except for some minor details! But this ability requires energy, thus, the robot can't use that at all times.
It's also basically an anti-projectile unit, since it has Arrow Block III, giving it the ability to block arrows and deflect them at their target!
It's main means of attack are revolved around it's three weapons, at long range, it will throw Energy Shuriken at the player, those don't pierce like the arrows, and deal low damage, but they are thrown quicker than arrows are fired, to compensate. The MK2 version's Shuriken home slightly on its targets.
At mid-range, it will use it's Kusarigama, it can slash the player's robot with the blade, pull them closer by sticking the blade on their body, or it can knock them down using the weight on the other end of the chain. The MK2 version is quicker, and can work at a longer range
At close range, the Ninja will pull out it's Katana, it's a variation of the sword, being quicker, but dealing less damage, it will also pull it out to deflect an arrow in case on is fired against it. The MK2 version is quicker, and has Unbalance I.
This robot is also quicker than normal, except when using it's stealth ability, in which case is as quick as other robots.
The MK1s should appear in Gold, with the MK2s appearing in Diamond.
Full names: MK1 "Ninja" Infiltrator Robot, MK2 "Ninja" Infiltrator Robot