Just made an account to start posting! I have been a reader for some time, but I really want to participate in the conversations =P
I thought about 2 sets of abilities. Both sets works based on percentages of the users own nen. I will post just one for now, as i dont have the time to write all I want.
1° set: Screening / Betting area. This set of abilities requires you to have a good fighting experience and knowledge. Also, the person should have experience in betting. Its actually a simple ability, but its a bit hard to explain in text.
Screening - self manipulation, or specialization?: An ability that gives you a a notion on the amount of nen a person haves. It will be used on your own vision. While using it, data will appear besides every person you can see. It will show the current amount of aura / max. amount of aura the person haves. The absolute numbers will be based on your own, since your aura will always be 100. So, if the person has roughly 20% more aura then you and is rested, the numbers shown will be 120/120. if the person has, for example, 10% less aura then you, and is tired, it will show 60/90.
This ability, besides beeing a very good information source on its own, will be a necessary tool for using betting area.
Betting area - specialization: Must be activated on self and another person. Both have to dispose of a certain quantity (percentage) of their own aura, and one will not be able to know how much the other disposed. The disposed aura is lost, as if used in an ability. If a certain person disposes a total quantity (even though you dispose of percentages, the ability will count the absolute number, on the same basis of the screening ability) that is 2x or higher then the quantity disposed by the other participant, the loser (one who disposed of less aura) will lose its ability for using any form of nen for a day. If no one disposes more then 2x what the other disposed, both loses their disposed auras and the ability is finished.
The conditions for it is that after the ability is used, both "players" will be impervious to each other´s damage for 1 minute and 30 seconds, or until both disposes of their aura. The ability have to be explained in 1 minute by the user, so the oponent knows of its advantages and disadvantages.
This ability can be used in various ways. If the oponent is stronger then you, and have a bar of, for example, 115/115, you could bet 90% of your aura, so if you do not win the bet by disposing almost all your aura, you can be sure the other person have disposed a lot of aura too. Again, for using this ability you should be decent at fighting without needing nen. This ability would also be quite weak against born geniuses like gon for example, who could have a 250/250 bar - case in which you are fucked =D
That was the worse situation. If you are very tired, and is fighting against a strong, rested oponent, you can use this so you lose the rest of your aura, but makes the other person loses more than you, because of being afraid of losing the game.
There are a lot of uses for this ability, and a lot of situations were it can potentially turn the tides of a fight. It is rysky, but as you have the Screening advantadge and poker experience (lol), you should be fine.