My friend was the plaintiff on a Spanish court show... It was "acted" so an acting job; he spoke a ton and was one of the "leads" I guess.

Does it get listed as principal or lead on the resume?

Court TV shows no matter how much it's scripted doesn't go on an acting resume.

Do you know the reason for this, why it doesn't go on resume even if its acting?

Reality TV just isn't taken seriously no matter how scripted it really is.

What if he wanted to list it anyways on Lacasting cause he doesnt have anything else at the moment and remove it later...

Would it be lead or?

Guest star I guess.