The two rivals: Mario and Sonic...or rather Nintendo and SEGA!
The two companies, founded in 1889 and 1951 respectively, are two of the world's largest video game development companies--Nintendo with Mario and Sega with Sonic.
Mario: Mario is an Italian-American character who plays a plumber...Or the savior of multiple worlds and varied dimensions from various enemies, including his arch enemy, Bowser, a fire-breathing turtle who constantly kidnaps Princess Peach.
Sonic: Sonic on the other hand is a blue hedgehog who goes very fast, but just VERY fast! He fights against various enemies, including Shadow and Eggman.