Keiff is a (very) minor character in the Decap Attack story Monster of the Year. Along with two companions, the bald-headed thug sits in the seats reserved by Professor Frank N. Stein and his entourage. Keiff is the one to talk to Head, demanding he leaves the carriage before he gets violent. Head tries his best to talk to Keiff but Chuck continues to throw out disparaging comments from under his coat. In the end, sick of being insulted, Keiff smacks Head, causing the skull to fly off Chuck's shoulders. Thinking he's killed a man, Keiff and company run from the carriage, getting Chuck's friends' seats back.
Keiff is almost certainly actually called Keith, but the heavy accent is spelled out as Keiff.