From the Super Mario Wiki
“You're amazing! I can't believe you solved it! I'm impressed!”
Sushi is a character in Mario Party Advance. According to his description, he is commonly found in the ocean surrounding Sushi Cliff, and despises criminals. He is found at the base of the cliff, calling out for help.
When approached, he says that someone falling off the cliff, but is interrupted by Shroomlock diving out of the water and onto the cliff, startling him. Shroomlock then reveals that someone had tried to purposefully drag him off the cliff, which leads Sushi to state that he didn't see Shroomlock fall. However, he says that there were three witnesses to the crime (Blooper, Cheep Cheep, and Dolphin), and he interviewed all three of them. Sushi then proceeds to state the three witnesses' alibis, which leads to the deduction that Blooper was the only who could have done it, due to him being the only one with appendages. After Blooper admits to the crime and dashes off, Sushi is amazed at the player's skills of deduction, and gives the Digitizer Gaddget as a reward.
In the ending credits, it states that Sushi decided to open a bed and breakfast at the sea.
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