Can you make some headcanons about the Uchiha twins and the Hyuga siblings ?
Uchiha Twins (Sanyu + Sachio)
Sanyu is vv aware of Sachio’s dislike and big insecurity towards his pink hair. To indirectly help him, Sanyu would purposely act girlish and sometimes. He’d purposely change the pitch of his voice into a higher one, sway his hips a bit more, and things of such likes. In his opinion, if he acts girlish, Sachio would feel and be perceived as a bit more of the masculine figure despite his pink hair.
Sachio being the first natural born pink-haired Uchiha is actually something Mikoto and Fugaku was amazed. Uchiha genes are really strong, so when Sachio was born and took after most of Sakura’s genes, they were beyond amazed.
As kids, Sanyu and Sachio have the habit of the typical idea of “twins speaking at the same time”. (i kno it doesn’t happen in rl but seeing this typical twin anime thing, i just couldnt resist XD)
Hyuga Twins (Ryuuji + Tora)
If we base Tora’s personality in the “dere” archetypes, Tora would fall either in the Kuudere type (cold, distant, somehow emotionless) or in the Hinedere type (refer here for explanations)
Despite being younger by a few minutes from Ryuuji, Tora is actually more of the protective twin. She has been more exposed in martial arts compared to her brother.
There’s no real reason why Ryuuji doesn’t really favor martial arts. He’s aware of a few moves, but not as much Tora knows.
One distinct difference between Tora and Ryuuji in terms of their interest is their food choices: Tora has a really high tolerance for spicy food while Ryuuji has a very low tolerance for them (like Neji).
Tora and Ryuuji are half Chinese by blood, considering that Tenten is actually Chinese by blood. Although not fluent, they know a few phrases in Chinese.
Tora’s name means “tiger” while Ryuuji means “two dragons”. It’s a reference to the Chinese (?) lore of the tiger and the dragon- which represents the Yin and Yang concept.