The Missing People all have different mannerisms, attitudes, and personalities. So here's a little breakdown of this group dynamic that the Cartoon Buddies differently had. The Missing People split to pairs of Nice, Mean, and In-Between.

Hellen/Violet is the kind-hearted, nervous peacemaker and Timothy/Matty is the joyful, good-hearted scatterbrain, showing both Hellen and Timothy are Nice.

Michael/Mike is the assertive, short-tempered dimwit and Jack/A Week with Javier Javier is the hot-blooded, hot-tempered fighter, showing both Michael and Jack are Mean.

Kyle/Monarka is the strategic, reasonable genius and Jessica/Mindy is the positive, quick-witted tomboy, showing both Kyle and Jessica are In-Between.

This is how the Missing People have that group dynamic, even if they can be constantly mean but they are actually occasionally nice as they are paranormal spirits. Also, I got this specific group dynamic called Nice, Mean, and In-Between from TV Tropes, where groups of three characters have different, attitudes, and personalities, meaning the nice character is indeed nice, the mean character is the indeed mean, and the in-between character is indeed in-between, mostly specially from many, several fictional works. Pretty surprising, huh?