The Loan Shark's weakness is the Geyser because they prefer water that doesn't fight back.
Like the Legal Eagle, they are the one of the only two cogs based on animals instead of humans. Coincidentally, both the Legal Eagle and Loan Shark are level 7-11 cogs, have 2 signature moves each, can only be found in their respective buildings, and are both the 7th cog on the Corporate ladder.
On the Loan Shark's trading card, the Loan Shark is seen loaning a Toon jellybeans, due to the fact jellybeans are Toontown's currency.
The Toon is signing "Sucker" on the contract, signifying that he's about to be suckered in.
Name of origin
A loan shark is a person or body who offers loans at extremely high interest rates.