From the Super Mario Wiki
“Ah! I am m-me! This is first time. ❤”
The Oho Jees are natives of the Oho Oasis in Mario & Luigi: Superstar Saga. When spoken to, Oho Jees use broken grammar and say bizarre things. There are two varieties on the main island: red ones and blue ones. Two smaller islands south of Oho Oasis house a green and a purple Oho Jee, both of which have afros. Their name comes from oho (an onomatopoeia for laughter), as well as sounding like "Oh jeez", an expression used to show surprise or frustration.
According to a boombox recorded by an expedition group, one of the members was attacked by an Oho Jee, and was then transformed into one. However, they are not enemies by nature, and will not attack unprovoked. If the Red or Blue Oho Jees are hurt by Firebrand or Thunderhand respectively, they will become wild and face Mario and Luigi in battle.
At the beginning of a battle, Oho Jees will have 70 HP, and their only attack is spinning wildly at the brothers, which can be countered by jumping on them. Blue Oho Jees will spin quickly in a diamond pattern, while Red Oho Jee will spin slowly in a circle. Red Oho Jees are healed by Firebrand and are weak to Thunderhand, while Blue Oho Jees are healed by Thunderhand and hurt by Firebrand. The Oho Jees often act strangely in battle: they may run away and, if they are unable to escape, come back saying "I no believe!"; they may hum a song, which slightly heals the brothers; they may say something nonsensical, which wastes a turn for them; and if they are healed too much, they will deflate like a balloon and the battle will end. After their defeat, they will lay on the ground for bit only to jump back up and say a random quip.
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