These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
JerkGod-Mode Sue: Golgo 13, aka Duke Togo, is a Draco in Leather PantsBad AssCold Sniper with a 100% accuracy rating, is a multi-billionaire, has played a hand in just about every historical event of the past forty years, and beds just about every woman he comes in contact with (and is awesome in bed, no less)... but it all kind of works, doesn't it?
It helps that the series focuses more on the events that require his intercession (Or the people trying to stop/catch him) than on Duke Togo himself as time goes on. His overwhelming ability is doled out in controllable doses.
Memetic Mutation: Duke's face has gone memetic much like the 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'.
Moral Event Horizon: In the first anime movie The Professional, Corrupt Corporate Executive Leonard Dawson, seeking revenge for the assassination of his son Robert, crosses the horizon when he becomes desperate enough to concede to a Psycho for Hire'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 Pragmatic Villainy: 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.
What Do You Mean, It's Not Symbolic?: 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...