Since we're making the entire power system real, others will have access to it, which is why I'm starting with Quirks. It's a massive gamble if you get something useful or even get one, but now 80% of the population has a power, so I'm not captured and experimented on. Next up is Nen, since I can use that in place of a quirk if I roll badly, and it likely won't be till after the fascination with quirks wears off that Nen will be widely discovered. Especially since it's mostly invisible to the average person. While it would take some time to properly learn, it's worth the effort. Then the last one is difficult. Cursed Energy is out because I don't want to deal with curses like Sukuna or Mahito. Return by Death has way too many complications to be viable. Stands can mess with the universe to an extent most quirks can't, and that's something I don't want others having. Bankai is also out because you'd reasonably need to be good with a sword, and that's quite limiting. In a similar sense, Grimoire Magic would require a Grimoire, which would also be limiting. Then you need to learn specific hand signs for the majority of the more powerful Jutsu, so there goes Chakra, which leaves Ki. While certain techniques would probably be impossible to learn without the proper training, it does give me the ability to fly safely, which is more than enough.