From what I know about Star Wars lore, Vader and Tarkin are more or less equal in terms of rank, so probably not.

Emperor Belos had one of the Golden Guards who helped him blow up a town in the past and the Collector (albeit in an unwitting manipulated pawn kind of minion).

Belos has the Collector

Palpatine has Vader and Dooku

Mrs. Tweedy has Dr. Fry

Cutler Beckett has Davy Jones

Morgaroth has Dark Mayhem.

Emperor Belos has the Collector and a Nameless Gold Guard

Emperor Belos has The Collector

Joker (Arkhamverse) has Harley Quinn

Emperor Palpatine has Count Dooku and Darth Vader

Ozai and Azula

Scarecrow (Arkhamverse) has Arkham Knight

2018 Micheal Myers has Corey Cunningham

Muzan has several of these.

Freddy Krueger has Jason Voorhees not sure if that counts

@TheShape2344 I don’t really think so due to not really together while Freddy did bring him back they weren’t together or work together to kill people but If I works for you it works for you not sayin* you’re wrong just saying my opinion