Tyson speaks with a broad, yet posh, Cambridge accent usually.
Without his stutter hindering him, his vowels weren’t as stretched - reducing how broad, and deep, his voice sounded overall - and drawing attention away from the sharper, clipped edges of his consonants; a slight inflexion led by considering Hebrew to be his first language.
Whenever Tyson is becoming sick or already running a fever, he tends to stutter more on the letter P; due to the way the internal temperature increase messes with his tongue.
When drunk, the letter R becomes nigh impossible for Tyson to form properly, it becomes a W instead. A stark contrast to the rolled R that had been drilled into his usually precise received pronunciation by countless tutors, but that’s rather the point: it was drilled into Tyson to rolled his Rs, leading off of Hebrew, Tyson doesn’t naturally enunciate his Rs.
There are three accents that Tyson can reliably imitate: New York (Brooklyn/Queens), Cockney/Essex, & Dublin.
His New York accent definitely leans stronger towards Brooklyn where, once again, Tyson is guided by his Jewish roots, but when Tyson ends up having to maintain his New York accent, he inevitably gets lazy about his pronunciation and strays into Queens a little, particularly on longer words.
Similarly, his Essex accent is spot on, to begin with, but when he’s speaking for an extended period of time, it will end up straying into a more generalised Cockney. The only accent that Tyson can reliably and consistently produce outside of his own without it straying is a Dublin accent. He has that one down to a tee.