Those were the words I was looking for! A crush but more like platonic admiration. I think we've felt an attraction to someone based on their words and actions but it's more about the kind of person they are rather than the person themselves. You'd be happy being considered a close friend of someone like that but not necessarily intimate.
That is something to look forward to, getting to know Nikos as himself and not as Argos. Will he be a sassy tease who becomes the MC's wingman? (Speculating, not an actual question to necessarily answer.)