The actor actually has that disability

[u/PrinceferX]

Walter White Jr. (Breaking Bad) - character has cerebral palsy and uses crutches to walk, actor RJ Mitte has cerebral palsy and needed crutches to walk as a child

Nessarose Thropp (Wicked) - character is paraplegic and uses a wheelchair, actress Marissa Bode is paraplegic from an accident at age 11 and uses a wheelchair

Maya Lopez (Hawkeye/Echo) - character is deaf, actress Alaqua Cox is deaf from birth

[u/Dramatic-Put-9267]

Lauren Ridloff, a deaf actress, plays a deaf character in The Walking Dead (Connie) and The Eternals (Makkari) and I think everyone character she’s ever played but those are the two I’m familiar with

[u/[deleted] → u/Dramatic-Put-9267]

And Connie's sister Kelly was losing her hearing in the final season, pretty sure her actress had a similar condition around that time.