Steele getting preg is a given, Will choosing not to answer which one makes me think that it will be both. Or I don't know anything about Will and I'm dead wrong.
and on the topic of a hated nemesis, I would recommend watching this video. Prak Jaws was one of if not the most immortal and troublesome orks in all of ToG's shadow of mordor gameplay. Prak was virtually indestructible, could kill the player (i believe) in 1 hit, but that is relatively normal for a nemesis in that game series. What made Prak something for me that was unforgettable was the perfect cross of unique variables.
Sometimes, very rarely, an ork would choose to humiliate the player by sparing them as they walk of screen and then de-spawn. This is extremely rare, and Prak did it
every, single, time. Prak also didn't speak. his only communication was a series of grunts, screams, or giggles. Prak also constantly ambushed ToG, just all the time and at any completely random interval, this juggernaut would appear looking for a fight. Then, on top of ALL that, even if ToG played out of his fucking mind, Prak just came back later. The man refused to die.
Forever that has been something I want to introduce naturally into a story, some immensely powerful, unkillable beast of a man who shows up and beats up the player, and then walks away. He's overpowered, but he never finishes you off. If it's a party based game, he just knocks one of your team unconscious and then leaves. There is something just so fun about that for me.
TLDR: I guess this is just me ranting about what I think are great characteristics of a nemesis that isn't quite a rival. Hope it isn't completely off topic.