You can choose a super power however the next to respond chooses a side effect.

[ColdJ]

SE: It is your job to fix them again.

SP: I can talk bad people out of wanting to be bad and convert them to good.

[kerbiloid]

SE: Now good people do all the same, for even greater good.

SP: Ability to see all acting beings (humans, animal, AI) around in frozen time, like in VATS sniping mode in Fallout.

[Stormpilot]

SE: you see all active beings. The amount you see is overwhelming and you can’t see.

SP: S P E E D

[iamn00b]

SE: when you said "speed", you mean "methamphetamine", and know you have developed a severe, unrecoverable addiction of it, and you are a fugitive wanted for drug abuse.

SP: I want to be able to choose my own side effect

SE: I don't get a superpower because I didn't pick one.

SP: I want to stop aging completely and be immortal.

[OrdinaryKerman]

Side effect is that you need to be plopped in plainclothes into the Joint European Torus reaction chamber (while it's running) to do so. You also don't have heat resistance to help you survive. And you turn magnetic while choosing another side effect. So you get stretched by the containment magnets and blasted with superheated plasma. 

I want to have the ability to not have any other superpowers.

[ColdJ]

SE: You under perform in everything you do.

SP: I can walk on top of any liquid without sinking in to it.

[iamn00b]

SE: The Navy spots you and launches missiles to neutralize your threat.

SP: I want to be able to shapeshift

[ColdJ]

SE: You can only shapeshift into office supplies.

SP: I can type 1000 words a minute.

[Starwaster]

SE: the words are random

SP: I gain the ability to cast the spell Crushing Despair” on anyone no matter where they are in the world. 

[ColdJ]

SE: The spell always effects you when you cast it and much more than on the people you cast it on.

SP: I can adapt anything to do what I need it to do.

[AlamoVampire]

SE: every object that is like the object you alter alters with your chosen object. This causes mass chaos and disruption around the world.

SP: the ability to fly like superman.

081909082021

[Stormpilot]

SE: every 15 seconds you fly, you lose 1km to your top running speed. Pretty soon you walk slow and soon enough you can only walk backwards.

SP: cure to sore legs after running.

Edited September 9, 2021 by Stormpilot

[SpaceFace545]

SE: Your legs aren't sore but you also can't feel them, let alone move them

SP: X Ray vision!!

[AlamoVampire]

SE you can only see in the xray portion of the spectrum. All other wavelengths are lost to you.

SP fire bending

233509082021

[ColdJ]

SE: Everytime you bend fire it hits you in the face.

SP: I can go back 1 hour in time and correct any mistakes I have made.

[Space Kerbalisation Tech]

side effect: every time you go back one hour it creates a duplicate you (one from the past, one from the future) and it gets so annoying and strange that you proceed to rickroll yourself as it's LESS annoying

superpower: the ability to play ksp in real life

[ColdJ]

SE: You always forget to save and the Persistent save rubs it in your face when you make a serious mistake.

SP: The ability to turn small detailed models that fit in your hand, into full sized working craft.

[Stormpilot]

SE: there made of there model material so the thin plastic crumbles at full size.

SP: to take real full sized trains and duplicate N scale working models of them with DCC sound decoders.

[ColdJ]

SE: every time you try to take a real train to duplicate, you get arrested.

SP: I can transmute Steel into Titanium whenever I want to.

[Lewie]

SE: but for every metric  ton of steel you only get a singular titanium atom

SP: I can stop procrastinating so dang much 

[ColdJ]

SE: You can but you keep getting distracted and forget to.

SP: I can 3d print anything without needing a machine.

Edited September 15, 2021 by ColdJ

[kerbiloid]

SE: You are playing with a concrete mixer.

SP: I can be able.

[ColdJ]

I don't understand the last SE.

Your SE: Only when you are around Cain.

SP: I can sketch anything in a minute.

[adsii1970]

SE: but it then comes to life and tries to consume you.

SP: I have the ability to whistle any song backwards. 

[BuranAce]

SE: But every song you whistle becomes backwards forever

SP: I can fly any aircraft