Okay... Okay... Okay
I guess is now my time to post something in respect of this discussion. Let's see how this rule goes:
"This type of ability (put ability here) is prohibited with this kind of ability in the same biography (such as having two KGs or SM with an Uchiha, I dunno, you know what I mean). But! people who had it before still can have it"
So let me understand how this rule works. Let's say I create a custom uchiha biography, then I stock it up with something along the lines of putting SM and EIG into it. Then some people know what I have done and repeat the same thing I had done, gaining a considerable advantage in the RP. The RP authority is aware of this and creates a law that prohibits the creation of further biographies with the same abilities I put on them, but I'm still allowed to keep the abilities because I done it before the law is created.
I can understand that the authority is following de facto laws, in which someone shouldn't be punished by a law that was created after they have committed the crime. But, this doesn't mean that they are able to continuesly break the law because they were able to break the law before it was implemented. Some people do not even update their bios anymore because the new rules were implemented, allowing them to keep all their abilities; while others update their biographies not being afraid of losing their abilities as they had it before the rules.
So let's see how it goes. I do something that causes a law to be created, which is imposed in everyone else but me, the culprit. This means I have access to a special biography created solely for me (and other people who followed before the law), but the law was created to prevent something like that. In such case, the law instead of interfering with me, it actually benefits me, as I access to something no one else has.
So here is what I suggest in doing:
1. If you update your biography, your biography should follow every law that has been created. This way your biography should follow the current laws instead of laws of the past.
2. Once a new law is created (such as not being able to have this ability in your biography if you have a certain KG or ability) you are obligated to update your biography conforming suggestion 1.
I know it may seem "unfair" to the people who had the ability beforehand, but it promotes actual balance and fairness into the game. This way we don't have really stacked biographies with multiple abilities, but a biography that follows laws and is "equal" to everyone else, though he may still have much more powerful abilities.
@Yard. The Pervy Sage has in his Natsu biography that he trained with toads in order to gain the ability to control sage chakra, but he is incapable of getting into Sage Mode. Controlling Sage chakra means being able to sense it and also to use some of it's unique abilities.
"Natsu got exicited at the thought of meeting Igneel again, and even more excited about the though of using more fire techniques. A couple of days after having his fortune told, Jiraiya took Natsu to meet Ma and Pa, the two elder toads in the village. After much talking they decided to teach him how to control natural energy. They took him to the sercret fountain where he'd go under dangerous training using the secret oil and learn to gather natural energy. Though the toads had to explain how their sage mode wouldn't work his with sharingan. And so Natsu mastered the control of natural energy but was unable to use it fully."
Well, those are my two cents.