Yuuji Endou

A dirty loan shark with ties to the yakuza. He lends out large sums of money to the desperate, but charges an absurd (and illegal) interest rate. He tracks down Kaiji after a client of his, Furuhata, disappeared without repaying a loan, which Kaiji cosigned in an act of weakness. Recognizing Kaiji could never repay the loan, Endō offers him the opportunity to board the gambling ship Espoir, where he would be able to repay his debt and make some money as well.

(Source: Wikipedia)