* EscapistCharacter: Just like Duke's inspiration Franchise/JamesBond, Duke is a consummate assassin who is very, very successful with the ladies.
%%* HoYay: Robert Hardy and Thomas Waltham.
* MemeticMutation: Duke's face has gone memetic much like the [[{{Bara}} Yaranaika face]] among Japanese artists, and gets slapped on just about any character's face as a source of quick comedy due to its out-of-place 'coolness'.
* MoralEventHorizon:
** In the first anime movie ''The Professional'', CorruptCorporateExecutive Leonard Dawson, seeking revenge for the assassination of his son Robert, crosses the horizon when he becomes desperate enough to concede to a PsychoForHire's demand to be allowed to rape Robert's wife. And things get worse from there.
** In the series, Togo passes a potential MEH of his own when he sleeps with and later kills an innocent who makes the mistake of following him to a job. This is played around due to Togo's PragmaticVillainy: He won't betray a client even under torture and one of the few times he failed ("Telepath") he tried to return the money (he later made good.) However, he doesn't care who his client is, who his target is, or the reasons behind the hit. As long as he's paid and not double-crossed, eh, anything goes.
* SerialNumbersFiledOff: Takao Sakai originally wrote Golgo 13 as a way to continue making James Bond-style stories while bypassing any copyright issues with Ian Fleming.
* SpecialEffectFailure: The infamous CG helicopter scene in ''The Professional''. It... doesn't hold up, to say the least.
* WhatDoYouMeanItsNotSymbolic: The codename "Golgo 13" is apparently a reference to Golgotha, the hill where Jesus Christ was crucified, and Judas Iscariot, considered the 13th person at the last supper Passover meal, (though, in reality, there were AT LEAST 14 people there, it's a common association). For bonus points, the Japanese logo for the series prominently features a skeleton wearing a crown of thorns...