You could not make up a character like Gerald. It’s Impossible.
Sometimes I listen the Scottish side of my family and go…Whaaaat? Even though, as a child, I used to sound exactly like them.
This is called either Cotswoldian or Geraldian.
I totally get his vibe. Not many understand my words although my accent is now Received Pronunciation or R.P. English….with a touch of Lincolnshire, London, Geordie, Scouse, Yorkshire and very bad Glaswegian words.