So a ninjas that is supposed to be a sign in ninja (shikamaru) and given as event later on (sasuke) are now supposed to be unobtainable?

If the problem is naming, just rename them. And what will even happen so swimswuit Ino? She is barely using any clothes :lol . And who would even complain about the words Playboy and Make-out? There is literally an empire named Playboy and didn't they go to highshool and made-out with anyone?
Also easy fix, use the japanese names on the rename, problem solved.

If the problem is NA censorship, what about EU and Asia/Oceania servers?

If this is just a ruse to get players to buy this ninjas because they arent doing it and Oasis needs to prove the game is profitable to the shareholders (it did only open mid year), it's a really dirty trick and Oasis should be above that. Its a really low standard if they try to pull this.

was typing before reading your message.

so it leaves option 3 which is the worst reason, but i understand you cant tell us and will not pu*

So is it realted to the image rights and art work of the characters, that may belong to someone else, that decided to ask for more money for its use? This happens a lot with YuGiOh! card designs.

Please do ask the higher ups if they can make an announcement actually saying what is going on, because if it is a rights case then it will most likelly end in a removal from the ninjas for everyone, even for those that already bought them. Or a complete revamp of the way these ninjas look and the animations for them.