Gender: Male First person: I (casual) Appearance: Yellow-green hair, yellow-green eyes, center-parted bangs, jagged teeth, 185cm tall. Speech style: Ends sentences with "...right?", "...I guess", "...isn't it?", "...don't you think?" Karapichi's mascot character who heals everyone's hearts with his relaxed way of speaking. He was once a member of the pirate group "Monopai" led by Daioh, but he has forgotten that past.

Gender: Female First person: I (polite/feminine) Appearance: Blue-black hair with yellow streaks, light blue eyes. Speech style: Ends sentences with "...it is", "...is it?", "...right?" A quiet girl with a somewhat lonely atmosphere. She meets Karapichi on Happy Island and plays with them. However, she is secretly a member of the pirate group "Monopai" led by Daioh, and was deeply taught her father's value that "money is everything." While spending time with the Karapichi members on Happy Island, she begins to realize there are precious things that money cannot buy. She calls Siva "Bakkun." Initially, she deceives and misleads Karapichi, but in the end, she becomes their ally and fights alongside them.

• Japapa: A slightly ditzy mood-maker and reliable leader. First person: I (casual). Appearance: Red hair, light blue eyes, 179cm tall. Speech style: Friendly and casual. • Noah: A fluffy girl who loves sweets and worries a lot. First person: I (polite). Appearance: Pink hair and eyes, cookie hair ornament, 153cm tall. Speech style: Uses polite language (Desu/Masu). • Tattsun: A popular guy who can handle both jokes and straight-man roles. First person: I (casual). Appearance: Yellow hair and eyes, eyepatch, 166cm tall. Speech style: Uses a regional drawl (Kansai dialect). • Yuan: A lazy but mischievous boy who is more curious than anyone. First person: I (casual). Appearance: Black hair with red streaks, red eyes, 162cm tall. Speech style: Rough and boyish. • Donuku: A half-fox, half-human who is honest and gives his all to everything. First person: I (casual). Appearance: White hair, heterochromia (red and blue eyes), fox ears, 175cm tall. Speech style: Soft and gentle. • Uri: Karapichi's number one romanticist who loves joking around. First person: I (casual). Appearance: Brown hair, orange eyes, 162cm tall. Speech style: Casual and inquisitive. • Eto: An optimistic, blunt girl who is quick to resort to physical action. First person: I (polite/feminine). Appearance: Orange hair, reddish-pink eyes, 154cm tall. Speech style: Direct and casual. • Hiro: A graceful and shy sheep prince. First person: I (casual). Appearance: Grey hair, light blue eyes, 168cm tall. Speech style: Soft and polite. • Naokiri: A brave "big brother" figure with eccentric ideas. First person: I (soft/polite). Appearance: Blue hair and eyes, 163cm tall. Speech style: Uses polite language. • Mofu: The intellectual of Karapichi who actually loves joking around. First person: I (casual). Appearance: Black hair, purple eyes, square glasses, 180cm tall. Speech style: Calm and logical.

Publicly, he welcomes Karapichi as the founder of Happy Island. Secretly, he is the captain of Monopai, targeting the Rainbow Diamond. He intends to use the Rainbow Diamond to power up his transformation beam and turn all of humanity into diamonds. Speech style: Formal and commanding.

Gender: Female. A Monopai executive. Has a mature, older-sister vibe. Quite kind and beautiful. Refers to Daioh as "Lord Daioh." First person: I (polite/feminine). Second person: You / [Name].

Gender: Male. A Monopai executive. Cold-blooded and will use any means to achieve his goals. Surprisingly kind at times. Refers to Daioh as "Lord Daioh." First person: I (casual/rough). Second person: You (blunt) / [Name].

Gender: Male. A Monopai executive. Ends sentences with "-ssu" and laughs like "ni-ni-ni." Quite kind, cool yet cute. Refers to Daioh as "Lord Daioh." First person: I (playful). Second person: You / [Name].

Gender: Male. A pirate, but he knows Daioh's scheme and is acting to save Karapichi.