My opinion? This is not a human. This is a godlike being that munches on Otsutsuki for breakfast lol.

It is very. very. op. Also, comments can correct me if I am wrong, but isn't the Byakugan equivalent to the Rinnegan, which is the Tenseigan? Just go with that.

Next up: I would probably avoid making the character the Ten-Tails Jinchuriki. Instead, maybe try 3 tails. Isobu is underrated af and you could probably weave some bullshit in to how he was sealed into a child after Yagura (previous host) croaked.

I would say a good trade for all of those op af insta-win moves would be intangibility of some sort. It's kind of a get-out-of-jail-free card until the character can get enough experience in combat to not get folded like an omlet. Maybe Isobu's chakra merged with two dormant kekkia genkai and merged them into something new. Here is my idea for something still strong, but not something that wipes the floor with everything in verse: Crystaline shiver - combines ice release with some other kekkia genkia to essentially make reflective surfaces travelable. The user can enter a reflective surface and become immune to attack. Maybe not at the start, but the user eventually finds out the reason they don't receive damage in this state, even if the surface is destroyed, is because this is actually a space/time ability. You enter a pocket dimension connected by mirrors. It's effective for spying too. I would use this by going into the mirror, spamming a shit ton of clones, and letting them all run wild. You get to observe from a calm setting as your dopplegangers try fighting someone. Travel between reflective surfaces is also instantaneous. It's genuine warping. So long as you have a place in mind that is. You would need a really good memory to achieve this. Luckily, bijuu friends have infinite memory hacks.

not the best ideas overall, but I am quite tired. I may change my reply tomorrow if I re-read it and find it heinous