The 9th unlockable character in Garfield Kart is a hard one to get. The first thing you'll need to do to unlock them is get 1st, 2nd, or 3rd place the Lasagna, Pizza, and Burger cups on all speeds (50cc, 100cc, and 150cc). This will unlock the Ice Cream cup in all cc modes, which is our one way ticket to Nude Garfield Paradise.

Now you must place first in every cup in the game, including Ice Cream Cup, in every cc. After doing this, you will now see three stars on your title screen next to the Garfield Kart logo. From here, obtain platinum medals on every course in time trial. This will unlock you a fourth star for your menu and also earn you some money.

Don't waste any of that cash you've just earned, because now you must use it to purchase every item in the shop, including one of every booster. This will nab you the fifth and final star.

Now go to the kitchen and prepare a hot lasagna. BE SURE TO USE GROUND CHORIZO, NOT GROUND BEEF, GARFIELD HATES GROUND BEEF!!!!!

Set the hot pan of uncut lasagna down in front of your monitor. Pray to Garfield. Now hold L and R and select Garfield as you start a new single race or grand prix. You will be greeted with Nude Garfield in all of his glory. His stats are completely maxed out and his massive shlong will be whipping about.

Enjoy, Gamers. :)

EDIT: It has been brought to my attention by a fellow Garfilosopher that Garfield will NOT accept your sacrifice of a freshly baked lasagna when given to him on a Monday due to his absolute f u c k i n g hatred for Mondays. This may be why my guide hasn't worked for some of you, so I encourage all you guys to try it out again with this new trick in mind. Thank you and happy karting