on the topic of lars' jp and cn voiceovers, and the difference between the two:
(tl;dr: jp lars is more girlfailure himbo and cn lars is more babygirl himbo)
i think for jp lars the trope subversion is in the dissonance between the way he carries himself (playing up the cool suave persona) and the way he actually is (silly, earnest, kinda clumsy). he imbues his lines with a dramatic flair, playfully inflating his own ego, and it's precisely because of this over-exaggeration that both mc and you, as the reader, know he's mostly full of hot air (and doing it on purpose). i'd describe it as good-natured pomposity; he knows his worth, but he'll jokingly raise himself up a couple rungs to tease a reaction out of you (and to wheedle some praise out of you too, while he's at it). the trope subversion here is on a meta, narrative level, where the dichotomy exists in the way we see through his disposition; it's the contrast between what he presents himself to be and what we perceive through his actions.
whereas for cn lars, there are many instances where he directly lampshades this dissonance; he pokes fun at himself in a lighthearted, self-aware manner, deliberately affecting his speech with childish phrases that contrast his position and disposition. he is simultaneously the successful adult and the child at heart; the confident businessman and the petulant boy; the playful jester and the gentle companion. here, the trope subversion is within the character itself; cn lars' portrayal encompasses both aspects of his personality, letting the subverted traits peek through between the played-up persona. there's less dramatic flair, and perhaps less comedy as a result, but less hot air also means he's more down-to-earth and relatable.
while jp lars is funny because of how transparent his antics are and how quickly his hot air deflates, cn lars is amusing because of how earnest he is in both aspects of his personality, which ought to be diametrically opposite yet coexist so seamlessly within him. both portrayals make lars nuanced and endearing, just in different ways!
i'd elaborate more and corroborate with actual examples from the cn and jp lines, but that would probably expand into a whole essay, so... maybe next time! (i do love languages and linguistics, so)