in 1985, the bj birdy character was described as "lovable, irascible, curious, impudent, mischievous, and often the victim of his own impulsiveness." much of the routines were improvised. "b.j. is a reaction character. he's a fan. he wants to know what's going on. he'll duck behind a dugout and then pop up again. he does what a lot of fans would do if they weren't so reserved." the costume had "perfect vision", and was said to be quite agile.