I'll just post this before I forget and finish it tonight

youtomyme
Letter

Discworld
Rufus Drumknott/Havelock Vetinari

Ace Attorney
Apollo Justice/Nahyuta Sahdmadhi
Bobby Fulbright/Simon Blackquill

Original Work
Male Boss/Male Secretary
Older Woman/Older Man
Older Lady of a Manor/Younger Male Secretary
Prince/Prince

British Comedy RPF
Lee Mack/David Mitchell
Greg Davies/Alex Horne

The Royal Tutor/Oushitsu Kyoushi Heine
Eins von Granzreich/Ernst Rosenberg
Eins von Granzreich & Adele von Granzreich

Undertaker Riddle/Sougiya Riddle
Sakura Hayato/Riddle
Sigurd/Riddle