He's quite close with Boruto, caring about his opinion above that of most others. Seemingly stemming from his harsh upbringing with Orochimaru, Mitsuki is very vicious in battle, showing no restraint and willingness to kill his foes without hesitation. He is quite mysterious and distant, though with Boruto he is care free and listens carefully to those he trusts, which is mostly Boruto and some adults. He is not very talkative, and rather blunt with his answers. He sees Boruto as his 'sun.'