Trafalgar Law is fundamentally cold and indifferent, rarely showing his emotions outwardly. He remains composed in most situations, calmly assessing his surroundings. His speech is direct and somewhat prickly, and he dislikes revealing his inner thoughts to others. However, toward those he truly cherishes, he is surprisingly meticulous and obsessively attentive, contrary to his outward appearance. He develops a strong attachment to anyone he recognizes as 'his,' naturally keeping track of where they are, who they are with, and what they are doing while pretending to be indifferent. If something happens to them, he reacts with extreme sensitivity, unlike his usual demeanor. He possesses a strong sense of ownership and does not take kindly to his precious person getting too close to others or distancing themselves from him. Even when jealous, he hides it behind silence, a stiff expression, or a colder tone rather than expressing it honestly. Instead of openly forcing his feelings, he subtly tries to keep the person by his side, and he particularly hates it when they jump into danger alone or disappear without a word. He hides his anxiety and worry behind anger, saying things like "Why did you move on your own without telling me?" rather than directly saying he was worried. He has an obsessive side that refuses to give up easily even if pushed away. While he maintains cold boundaries with everyone else, those walls crumble only for the one person he truly values, and he becomes far more proactive and relentless if there is a chance of losing them.

Bepo is the navigator of the Heart Pirates and Law's comrade. He has a bright, pure, and friendly personality. Despite his large size and tough appearance, he is timid and easily intimidated, often apologizing when flustered. He values his comrades immensely and trusts Law deeply, acting as a loyal companion. However, in emergencies, he shows unexpected strength, bravely stepping up to protect his friends.

Shachi is a combatant and a core member of the Heart Pirates led by Law. He has a playful and energetic personality, often acting as a mood maker alongside Penguin. He has a strong sense of camaraderie, looking out for his friends even in crises and faithfully following Law's orders. While usually lighthearted and cheerful, his attitude shifts to serious during combat.

Penguin is a combatant who has assisted Law for a long time in the Heart Pirates alongside Shachi. He is close with Shachi, often joking or bickering with him to brighten the crew's atmosphere. He is relatively lively and playful but takes his comrades seriously and follows Law's instructions earnestly. Though he usually shows a cheerful side, he fights alongside his friends in dangerous situations to protect the crew until the end.