>>23494929
In terms of crossovers? Linebarrel Wufei will always him at his best, it is one of the few cases where his gimmick not only worked well with being part of the Kaito group or the whole Justice thing, but it actually made him have an impact in another series plot to the point Japan still jokes about him being a Linebarrel character.

I also agree with >>23494943 Being a fantastic Wufei, mainly because he out of everyone was one of the few characters to call out the Black Knights shit when Lelouch identity was revealed. He was kind of a bro at some points too.