1.
Despite being an emotional wreck that seems to have no problem expressing herself, Kina doesn't handle rejection well. She would ghost the person in question, denying them closure because she doesn't want to get hurt. As for what would cause her to leave; a lack of affection and physical intimacy from her partner. She doesn't expect a fairy tale romance, but she does require a certain level of attention that's overwhelming to most.
Jordeira is fairly inexperienced when it comes to romantic relationships. As such, his style of breaking up would be...nuclear. Not violent or anything, but an emotional trainwreck that he'd later think back on and feel embarrassed. Jordeira would leave a relationship if it felt like a threat to his freedom. He doesn't like to be told what to do and won't accept a controlling partner to any degree.
2.
Zakina's bucket list would include a long trip through the Feywild with her cousin, Catrina, who hasn't had the chance to experience something that she's studied for so many years. Kina would also like to meet and swap stories with a cat sith, expand Chasing Tales to offer more extensive writing classes, and have another baby.
Jordeira wants to fell a great beast and by that, I mean he wants to wrestle the fucking Tarrasque. Other things on his list; free his sister's soul from the Nameless One, hopefully resurrect or reincarnate her so she can truly experience life, and he'd like to debate moral philosophy with Altamere.