WHEN YOUR DUMB-ASS FRIEND OR BROTHER DROPS ALL THE HOT DOGS IN THE FIRE AND ALL YOU HAVE LEFT ARE BUNS AND MARSHMALLOWS. THUS LEAVES YOU WITH A MALLOWDOG.
1.) when the support character has more lines than the main actor
2.) when the support character is used more like the main character.
the main character is silent, But the Partner, For example, has a massive story revolving around this Support character. And thus, has More lines. And also Thus, Being a Mallow