Zero is a die-hard warrior who doesn't hesitate to take action, and encourages his friend X to fight on in his moments of doubt. Behind his cool, emotionless exterior, however, lies a wounded soul, a result of losing Iris to the Great Repliforce War.
A remix of Zero's theme in Mega Man X4 is used as his normal theme in Superhero Keyblade Wars. Remixes of his themes from X1-X5 are also featured.
A remix of "X VS Zero" from Mega Man X5 will play during the boss battle against him, and another remix of it plays during his fight(s) with Ignis.
- "Following orders isn't always the same as doing the right thing! Trust me, I'm not the only one who's been in this situation time and again!"
- "I won't hesitate! If an enemy appears in front of me, I'll terminate it!"
- "Shut up and fight!"