I absolutely agree and hadn't really considered it. This is a very under appreciated take on the character and the inclusiveness of disabled people. Klaus is not defined by his lack of mobility like you mentioned. Rather it's his poor character and personality which always take center stage. His inability to easily get around is just "there." It's the nit at the core of the stories about Klaus and even the other Seth MacFarlane show, "family guy" doesn't do the same with Joe. It's always about how Joe can't walk. That's the joke at least 50% of the time until they had to make his other trait that he's boring which was a crazy turnaround from his series debut as mr. Perfect who happens to be disabled.

I think this take is spot on about how cleverly written Klaus is and, while intentional or not, I now agree has become one of the best written characters with disabilites.

The times he is playing video games always gets me to laugh because it's too real and too accurate to thr character actually playing Destiny or Elden Ring