SD64CT II: 1st round (lost to Sonic)
Metroid Prime is the titular character of Metroid Prime. He is the final boss for Samus to beat. But unlike Zelda, this titular character has only one game, and is definetly less popular. A loss to Sonic is imminent.
Comments
"Even though Sonic did struggle against Samus, Metroid Prime just isn't liked enough to beat him."
~Super Smash Fan
"Who likes the game Metroid Prime? Lots of people! Who likes the final boss Metroid Prime? Very few! The people who got stuck on him are gonna vote Sonic, so he's buried!"
~ajc_11us