Abe Murdoc

Commissioner Abraham "Abe" Murdoc. Derrick Gacy's right hand man.

His look is based on the character of Daisuke Jigen from that classic anime crime/comedy masterpiece Lupin III (Jigen in turn was based on James Coburn, I guess it's an endless circle). In terms of roles they're opposites; Murdoc's a law enforcer while Jigen's a fucking outlaw.
Beyond that, Murdoc's a heavy smoker, he's always ready to use his gun and he has some '30s cop sass in order to contrast a bit with Gacy being a fucking beast.
Despite these differences Murdoc and Gacy get along flawlessly and he seems to be the only person Gacy genuinely trusts and respects (I suppose one isn't 100% a scary asshole).

Naming him "Murdoc" came immediately, it's a name that to me just fits with something police-related. As for "Abe"... Well, he does kinda resemble Lincoln too.