I, Kaguya Kimimaro

In the ninja world, how can you make yourself look like a member of the Otsutsuki clan using the simplest method?

First, transmigrate into the Kaguya clan, then use the Shikotsumyaku ability to grow two horns on your forehead.

Next, equip yourself with a pair of Byakugan.

Finally, capture a tailed beast and become its jinchuriki.

And there you have it: a low-spec, youth-version Otsutsuki Kaguya. From there, all that remains is to keep upgrading the accessories. One day, I, Kaguya Kimimaro, will be able to stand righteously before Kaguya Otsutsuki and teach her that an imitation can never defeat the genuine article.