Apple

Apple was the second character in The Annoying Orange and the first to die, he was killed by Knife after being annoyed by Orange

Trivia

It is unknown if Apple and Pear are friends since Pear didn't appear until after Apple died

Despite being killed in his first appearence, Apple had many references such as Toe-May-Toe

It is likely that after Dane Bodeighmer ate Apple after The Annoying Orange