Greatest scene stealer in a recurring role: comedy series

[Ned Flanders]

Eddie Haskell was a regular on LITB, but Lumpy always brought a strong game whenever he was called upon. 

 

[Simon]

26 minutes ago, Pecos Bills said:

Jimmi Simpson as a double scene-stealer: Liam McPoyle in It’s Always Sunny

 

 The McPoyles were one of the first things to pop in my head but i couldn't decide between Liam and Margaret

[Pete]

 

[Virgil]

Rafi in The League 

[Mike in Horseheads]

6 hours ago, Pete said:

 

Same show, Mr Hanky

 

 

[jayg]

Jerry Stiller. King of  Queens and Seinfeld.

[Figster]

 

[eSJayDee]

From way back when, Exidor from Mork & Mindy.

https://www.imdb.com/title/tt0077053/characters/nm0232817/?ref_=tt_cst_c_10

Somewhat of a regular, but Chuck (or Bob?) from Soap.