Job: Random Super Power System

I am looking to create a super power system for my GMod Server. I don't want the powers to be to over powered, but I want everything to look and feel really good.

The way the powers will work is players will consume a pill or inject something to receive a power. The item they inject or consume needs to be hand held, so they can use it at will but only once.

I have a few ideas for how they could function

1. Random power received for a short duration once consumable used
2. Sometimes the random effect could be bad
3. or Each consumable gives a certain power or effect, for a short period
4. Each player has a specific power, tied to there Steam ID or something, once they use the consumable they can use their specific power
5. Maybe people can pay real money to re roll there specific power

Price is not set in stone, I would like to discuss this further, if you are looking for a good reference of my idea, watch Project Power on Netflix!