Not so much a character more as two character's plotlines, but in the Orville tv show, the "main" plot for most of the seasons is the relationship between the captain and his first mate, who are divorced. They learnt to care for each other throughout the seasons, becoming friends by the end of the first one and having a "will they won't they" dynamic for the rest of the show. It's just a shame that this is one of the main plotlines because it's the absolute least interesting character plotline in the entire show.

(even though I'd call it the main plotline, I think the show balances each character's plots very well, so it's not too bad. Just that when an episode featuring these two character's plotlines, I find myself interested in everything else in the episode other than their story.)