This may be common knowledge, but I just found out that a circus performer known as Schlitzie has to be the real-life inspiration for Bertram. The similarities are too big to ignore. :
Bertram & Schlitzie - History in Red Dead Redemption 2 - YouTube
The Smell of the Grease Paint, Red Dead Redemption 2 Mission
Bertram Ambient Speech Red Dead Redemption 2 Characters Voice Lines - YouTube
Red Dead Redemption 2 - Bertram and Magnifico - YouTube
Bertram Voice - Red Dead Redemption II (Video Game) - Behind The Voice Actors
Arthur's first encounter with Miss Marjorie and...
The Smell of the Grease Paint | RDR2 Strangers Mission Guide | Red Dead Redemption 2
That stare is extremely cold 🥶 #arthurmorgan #bertramrdr2 #rdr2 #star... | Bertram RDR2 | TikTok
Comunidade Steam :: Guia :: The Story of Bertram - RDR2
IMHO about Metro: 2033 Redux - Return to the first part after 9 years - UmTale Lab
Red Dead Redemption 2 The Smell of the Grease Paint Stranger Mission Guide