(figuratively) larger-than-life characters do not associate with unnoteworthy characters, nor do they concern themselves with trivial matters / (literally) boat-swallowing fish do not swim in tributaries

(literally) a boat-swallowing fish / (figuratively) a colossal fish / (figuratively) a larger-than-life character/individual

suitable, well-fitting

Synonym of ぴたり / (to suit something) fine

to go forward, to advance, to progress / to improve, to progress

voluntarily; willingly

progress

(literally) the act of swallowing an entire boat whole

oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend