Mr. Ka-boom is Katie's father. He usualy causes some situations where Katie gets mad (Katie Ka-boom: Call Waiting) and tries to calm her down.
He has brown hair and wears a blue shirt and brown pants. He is voiced by Rob Paulsen, most famous on the show for his role as Yakko. Based on the appearance on mannerisms of Mr. Ka-boom, it is strongly suggested he was modeled after actor James Stewart, in particular his role as George Bailey from It's a Wonderful Life.
Mr.Ka-Boom