Dr. Gray Bomber (Dr. Graybon) is a main character in the Bomberman B-Daman Bakugaiden and Bomberman B-Daman Bakugaiden Victory animated series and manga. He was voiced by Kyousei Tsukui in the Japanese anime.
In Bomberman B-Daman Bakugaiden he is the grandfather of Blue Bomber (Aobon), a genius professor and inventor of the B-Da Armors that the heroes White Bomber, Blue Bomber, Red Bomber and Yellow Bomber use to fight against evil and protect B-Da City with. His grandson Aobon and his B-Daron, Rui-Rui, help him build the mechas which are kept in his laboratory.His teacher and mentor, Professor Bomber (Dr. Master Bom), was the one who taught him and Dr. Shadow everything about mechanics and technological science. Dr. Gray Bomber is quite lively and active for an old man, and has an optimistic view on things. He dreams of getting the fame and attention his inventions deserve; he also has a rather high opinion of himself, and perhaps deservedly so.