DM:
Joey did a few times. he does not know if he likes it but he does know he hates jeans now
thief king bakura for sure
Duke Devlin seems like a freak
Siegfried's underewear is so tiny that he might as well be having his german sausage just hang out

GX:
Misawa. just trust me.
Motegi
Sartorius fuck it

5Ds
Jack cant fit underwer under those pants
Crow can't
Yusei can't
Kiryu prolly thinks he doesnt deserve panties

Zexal
Astral

Arc V:
Sora so he can fuck yuya's mom easier