We need a Ben 10 mod, like with the omnitrix, where it's like the multitool with the alien selection and when you activate it, it shoots you with a playertype ray with a green explosion EFFECT that's the size of the player. There would be Ben 10 playertypes for each of the aliens:
XLR8-
Really fast and can go up walls.
Fourarms-
Can punch with a lot of damage.
Ripjaws-
Swims well and can bite hard.
Heatblast-
Can shoot fireballs.
Upgrade-
Can take over vehicles and recolors them black(when not taking over vehicles can Shoot laser blasts).
Grey Matter-
-Don't know-
Ghostfreak-
Can go through bricks and walls/fly and can stun players for 5 seconds by freaking them out.
Stinkfly-
Can fly and shoot green sticky blobs of goo.
Wildmutt-
Can run, and break stuff.
Diamondhead-
Can shoot crystals and is stronger than most other playertypes(crystals can deflect projectiles).
Also, for the Omnitrix, it is just a bit bigger than the player's hand and wraps around the player's hand.