The Stealth power/Ninja attack power up
The power up hides your power data from other riders for 30 seconds. I think this could create some interesting racing situations.
It would allow you to launch a stealth effort in the race, maybe going off the front of the group or helping to bridge to another group without others seeing your wattage output.
You could use it as a “dummy”, when another rider notices you using it they may put in an effort where you could then choose to follow their wheel.
I like the idea of it being displayed as either a ninja bandana or perhaps a stealth cloud around the rider’s legs and wheels to help hiding the glow of the Tron bike if you’re putting an effort down.