This simple creature wanders fearfully around the screen, mostly avoiding things and trying to stay out of trouble. He periodically switches into a different letter, cycling through the letters B, R, E, A, K, E and R in succession.
What you want to do is grab the Letterman when he is a letter that you don't have. While you're playing a game, look down to the bottom of the playing screen. Any DARK GRAY letters in the word BREAKER are ones that you need. Any YELLOW letters are ones that you already have.
If you get ALL of the letters in the word BREAKER highlighted YELLOW at the bottom of the screen, you will be richly rewarded with points and Eaties, and (most importantly) you will be given the power of the OGBURST!
The Letterman doesn't mix well with the other Breaker characters. If he collides with the Runner or the Shield Guy, there will be a grim RadZone explosion, killing both parties and potentially injuring you in the process! So be careful when you're near him.