New and realistic concept: Ninja
The importance of this troop is not the troop itself but the concept. This troop has both a direct attack (like a barbarian) AND a ranged attack (like an archer), and the type it uses depends primarily on walls but also on how many defenses it would walk in OR out of range of if it chose the direct attack.
Furthermore, an alternative option would be that this troop, if it is called a Ninja like in my suggestion, could possibly target defenses and even be invisible to Archer Towers and Wizard Towers, highlighting his stealth (this option would result in a decrease in damage and hitpoints.
None of the stats are set in stone, but are primarily to give an idea of the troop
Should the ninja NOT target defenses and NOT be invisible to Archer Towers or Wizard Towers:
Ninja
100 DE (cost)
10 minutes (training time)
10 (space)
200 (DPS)
700 (hitpoints)
32 (movement speed)
Strong and versatile, the Ninja strikes with fury directly, or from a distance of its target
Should it target defenses and be invisible to Archer Towers and Wizard Towers:
165 (DPS)
520 (hitpoints)
A master of stealth and sabotage, the Ninja cannot be detected by people, but it can attack from a distance when necessary
I don't have any pictures, but a ninja is somewhat self-explanatory in appearance--black ninja suit, showing only the eyes, while the ranged attack would be ninja stars and the direct attack would be dual ninja swords.
Thanks for reading! :)