genuine question, whats the problem with Denji and Asa as a couple? sure, Reze was a fine character but at the end of the day i understand her more like a device to further grow Makima as a threat and advance the story than an actual viable romance.
they are 2 confused miserable sad teenagers, i'd say that makes them more alike each other than Power or Reze thematically speaking and maybe thats what Fujimoto is trying to do here.
(i do prefer Power i don't care if she's his sister)