By a score of 21 to 8 over Davros in the finals, it's
YAWGMOTH
, from Magic: The Gathering!
Here's the full bracket:
https://www.bracketmaker.com/tmenu.cfm?tid=477621&tclass=
A big thanks to everyone who participated!
This signature won't change until Chrono Trigger gets a re-release on a modern Nintendo console.