For the Evulz: Nemesis tells Blake that he is the son of two complete psychos Blake busted and sent to their deaths but it's all lies. The son in question died before the story even began. Nemesis is just some rich, bored, bloodthirsty asshole looking for kicks as a supervillain.
Rule of Cool: How else is he able to stay on the outside of a plane mid-flight?
The Spook: His supposed identity as Matthew Anderson is all made up - the real one died in an India whorehouse after squandering his fortune following his parents' deaths. All Nemesis ever tells about himself is that he is rich and bored.
White Shirt of Death: His costume is entirely white, leaving blood highly visible on it whenever he's slaughtering people.
Establishing Character Moment: Performs a daring rescue during a hostage situation where he slips inside a store and swiftly guns down the criminals.
Expy: To Commissioner James Gordon. He actually resembles physically at the end of the comic when he retires and is wearing a pair of glasses as well as a mustache.
Humiliation Conga: Nemesis is driven to utterly break Morrow by killing thousands of innocents with him being unable to do anything about it, having his kid with his daughter being impregnated by her gay brother and having her uterus rigged to collapse if an abortion is attempted.
It's Personal: Morrow is seemingly on the receiving end of this trope by Nemesis, as he had previously arrested Anderson's parents for kidnapping and murdering innocents. Turns out this is a lie and Nemesis is just a random rich guy who gets his kicks by playing as a supervillain. After what happens to Morrow as listed in his Humiliation Conga entry, it could be said he flipped the tables towards Nemesis too.
Black Best Friend: He is pretty much this to Blake Morrow later its revealed to be subverted
Our Presidents Are Different: When Blake is faced with a Sadistic Choice, the President or his wife, both of whom are rigged with explosives, the President enforced a third option. He gets in Nemesis' face and orders Blake to blow him up.