Seto Kaiba first appeared as a villain. However, after losing a duel with Yami Yugi, he changed his ways and became a good rival. His signature card was Blue-Eyes White Dragon, called BEWD, and showed a dynamic way to fight.
There are many good monster with good effect that can be special summoned (even in 1st turn itself) at the current stage of duel link. Those days blue eyes were good with champion vigilance and not many other archetypes.