If you had the opportunity to add a letter to the alphabet, what would it be?

Describe the shape and the sound it makes, and why it would be helpful.

Who Dat ?2020-11-15T17:46:51Z

An H&R combined into one letter would be useful when you text your friends on official talk like a pirate day every year.
It would make the HAR sound as in Har matey.
It would also be useful when you're lying on your resume about which prestigious eastern university you got your imaginary degree from.