Myrtle

Myrtle (also known as Gran-Gran) is Pop Pop's girlfriend and the Loud kids' honorary grandmother who is introduced in "Insta-gran".

She was shown to be smothering the Loud kids, due to her not having a family of her own. She also is shown to like hanging around with her grandkids.

Trivia

 * She is, so far, the only female character to not have round breasts.
 * She is based on Darin McGowan's grandmother of the same name.