>>24474492same i ship them and think it sucks. shu becomes the ultimate beta male when with elira but at the same time his one sided love, for who knows how many years now, is peak cliche anime romance.
but with any other girl, he doesn't act any lesser of himself. using your examples, with selen he banters back because he doesn't want to lose, and with finana he'll (at max) bully her for her incompetence.
i personally enjoy petra shu the most since while he'll call petra "nee-san" he also tries to guide her - giving an alpha otouto vibe.