Four (X Finds Out His Value, Non-Canon Shorts, BFB 30-present)

Four is an integer and the main host as well as one of the three main antagonists (alongside Announcer and Purple Face) of BFB, and the non-canon one-episode series, Battle for Permission to Meet 10. Four and their co-host X first appeared in the 2008 video "X Finds Out His Value". They appear to be abstract beings representing real-life numbers, letters, or algebraic variables.

Why He Rocks

 * 1) He is a very calm, well-meaning and understanding number, and cares about his friends.
 * 2) He helped X on how to get his value, for example, he puts X on the seesaw and tries to help him to find a number to help him.
 * 3) He is very encouraging, as he tells X to never give up.
 * 4) He is more kind-hearted and upbeat compared to most of his other number friends.
 * 5) He is shown to be nice to the other numbers, even if they are rude to him.
 * Yes, he was very unlikable for most of BFB, but he started to mellow out by the end of the series and apologized for his very mean-spirited and cruel actions.

Bad Qualities

 * 1) He was badly flanderized in BFB, where he became more selfish.
 * 2) Likewise, it varies if he was in character or not in the non-canon shorts.
 * 3) His voice kind of sounds annoying, but not as bad as in BFB.