Which character had the biggest difference between their Japanese version and dub version?

[Warmmedown]

Is it Joey? Tristan the rhinoceros?

 

[DBZAOTA482]

Definitely Seto Kaiba. While he is generally cold in the Japanese version (particularly towards Jonouchi), he was more of a determined hardworker and had great respect for Yugi as a respect.

In the dub, he's a shittalking dickhead who just absolutely HATES Yugi and his friends for no real reason.

 

[Animelover5487]

Definitely Seto Kaiba. While he is generally cold in the Japanese version (particularly towards Jonouchi), he was more of a determined hardworker and had great respect for Yugi as a respect.

In the dub, he's a shittalking dickhead who just absolutely HATES Yugi and his friends for no real reason.

He also doesn't believe in magic (despite seeing it firsthand) and actively denies his Egyptian lineage in the dub.

 

[Yoshi]

I can only imagine the difference in quality of 4Kids Yugioh and a hypothetical Funimation Yugioh.