1) He packed so much personality in a measley 512 polygons

 

 

 

 

 

2) Neo Cortex > Dr. Robotnik, just gonna flat out say it.

It was me, neo rtex crash
via outer-dimensional-bros

 

neo cortex cosplay
via sedra60

 

(personally a fan of Clancy Brown's version)

 

3) His best friend is also a power-up

aku aku
via Matt McManis

 

4) Unlike every other gaming mascot, he never had a cartoon series, but they did produce this test animation:

 

5) He was there to make sure N64 owners never forgot who was in 2nd place.

mean nasty thing
via Sebastian Von Buchwald