I think Mitsuki is part Otsutsuki. He looks like a younger version of Toneri.
I see
so kakashi is a senju since he looks like tobirama
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lookalikes exist that does not show relation exist
The reason why mitsuki looks the way, he does would be because he's a clone of the character dubbed log. not because of any relation to toneri
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they dont even share the same hair color, Log has a bright blue whilie toneri has white looking blue. eye color is also different one being blue and other being yellow
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If you wanna go into teideigan toneri vs sage mode mitsuki
it's not even the same color of green also toneri's teiseigan does not physically alter his body where mitsuki's sage mode does as it gives him a visible physical horn
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if you wanna go from a plot perspective first off if the forms show relation then how did urashiki not recognize that type of chakra
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he did witness the events of ''the last'' somehow, he would surely know of teiseigan toneri's chakra
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Also toneri is defeated on the moon,
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Did orochimaru go to the moon without us knowing or something obviously no. It just happens that the designer happened to make mitsuki look like a prior character