Gamecube Ripping Help

Hi! First of all, my name is geoprimedonna and I am new here. Second, I would like to rip some characters from the game Starfox Assault (specifically Fox, Krystal, Slippy and Falco for now), but I need some help with this: I got lost when seeing the .iso's content and I don't know which one is who or what. I do not want to use 3D Ripper DX, but what could I do instead?
Please help!