Categories! Mover is powers related to enhanced mobility, Shaker is powers that change the environment, Brute is powers related to personal strength and/or resilience, Breaker is powers that alter the user's "state" during combat (like turning into mist, for example), Master is powers that can control other creatures, Tinker is powers related to being able to create advanced technology, Blaster is long-range offensive abilities, Thinker is any enhancement to senses or cognition, Striker is short-range not necessarily offensive powers, Changer is shapeshifting, Trump is any powers that interact directly with other powers, and finally Stranger relates to stealth and infiltration powers.

In addition to those types, powers are also usually given numbers to indicate rough level of ability. They were invented to classify villains, a few years back, but the public started using them on heroes, too, and they've started to stick.

He spends a while trying to work out what he'd be categorized as and then what sorts of hard limits on powers there seem to be.

Most powers are classified more based on how they're used in combat and how to react to them than anything intrinsic about them, although there are of course some regularities. His teleporting power would give him a "Mover Fuckton" classification—there are no numbers designed to describe something that can literally jump universes. Invisibility would likely be classified as a Breaker/Stranger power, and the application of demon magic to give him wings would be Changer. He could be classified as a Brute due to his indestructibility and depending on how he used the matter generation in combat, too, but it's fuzzier. The healing and turning-into-a-bird powers would be Striker, possibly Master, possibly Trump depending on whether people continued to have their powers in bird form. His regular senses alone would make him a Thinker, but osanwë's just overkill. His knowledge of future technology could reasonably make him a Tinker, and some more creative uses of matter generation could give him a rating in all other categories with the probable exception of Master.

As for hard limits, there aren't any known ones, but there's something called the 'Manton Effect' which is the observation that many powers seem to either work on living things, or work on nonliving things, with very little overlap.

That's interesting. He adds 'check if powers work on birded people' to the list of things to experiment with in the morning and resolves not to share any mind-altering magic songs.

After a few minutes Hero stops and looks at Epic. "Uh. Oops," he says, sounding sheepish. "Guess it works."

"Good. You might still have an adjacency limit, most things do, but we don't have a good way to check that. ...there's a magic song that speeds up your perceptions and thinking, it stacks on itself until you think about three and a half times as fast as normal but at that speed you get this annoying hangover when you come out of it and most people just use the one that doubles it. If you want to work faster."

"Okay wow yes I want that very much!!!!"

A snazzy 23rd century music player with all his non-mind-controlly songs is now on Hero's desk. 

Hero does not actually need his Tinker powers to figure out how to use that. What songs are there?

Perception (2x)

Perception (3.6x, read warnings)

Skip sleep (read warnings)

Ooomph

Sleep (standard)

Sleep (Millennia, read warnings)

Crop growth

Wind

Rain

Propulsion

Warmth

Focus

Navigation

Okay he wants to read the warnings first.

Perception 3.6x: This alters the mind but not the body; it will seem noticeably slower to respond to commands, and some people report feeling trapped in their body as it is markedly slow to react to their attempts to move it. When the song stops most people experience a hangover period of a few minutes to a few hours, varying by duration spent listening to the songs; during that time period you will be nauseous, clumsy, and have a migraine. It is common for this reason to drop into accelerated perception for weeks at a time so as to minimize the inconvenience of dropping back out; if you do this, please carefully monitor your diet to ensure you are eating enough or else heal yourself regularly. 

Skip sleep: Humans should not use this to go more than 96 hours without sleep; between 150 and 200 hours humans who have not slept will abruptly collapse and be impossible to wake for around ten hours (and, if not woken, will sleep for about twenty). Elves should not use this to go more than 240 hours without sleep; between 260 and 380 hours Elves who have not slept will abruptly collapse and be impossible to wake for about four hours (and, if not woken, will sleep for about twelve.) Species with sleep needs comparable to human tend to have comparable to human reactions.

Sleep (Millennia): This will put everyone who can hear the song to sleep until several hours after the song stops playing. They will not be possible to wake for at least half that time.

"What's 'Ooomph' and 'Propulsion' and 'Focus' and 'Navigation'?"

"Oomph makes - whatever you're doing - stronger, just sort of a force multiplier thing. It interacts weirdly with other magic systems, we can test, but it probably makes people stronger and might extend the range of their powers and if their power is kind of -blasty - then it'd probably be more blasty. Focus makes you not lose your train of thought but it also means you won't notice a siren and stuff. Propulsion makes boats go faster, it probably has a bit of an effect on cars too but not much of one, it's fun to stack with your own flight if you've got flight but not especially useful. Navigation points to magnetic north if you're on a planet."

"I kinda wanna test all of these and wow you're right I'm super awake but anyway if I go test these I'm not gonna be helping you with things."

"Yeah, we were going to figure out how to make fancy future vehicles and computers on your current tech base or one I could demon you."

"Right. Fancy future vehicles and computers. They're not much my speciality but can do. Um, what do we need? Should I show you stuff we have or...?"

"What is your specialty, we could start there -"

"Well, there's a bunch of future stuff. I have my jetpack and a disintegration gun and a stun gun and sonic weapons and I'm really good at batteries and other power sources!"

"Oooh, awesome, we can totally start with batteries." And he makes some future batteries in various states of dismantlement - "personal computers that fit in your pocket are a thing by ten years from now, ones like mine a century after that, and battery life's the main reason they're not even tinier -"

He looks at the batteries and declares, "I can do better than that."

"Awesome. So then the question is whether I can duplicate your stuff -"

He can!

He will cackle with glee and fly around the Dome ship and then collapse on the grass giggling.

Hero will grin and giggle, too.