>>532410338
>>532410664
Yrliet is by far the most developed character in game with a lot of reactivity, multiple main quests and side quests relating to her and entire third act being pretty much her companion quest. She is objectively number 1 and the most important companion in game.
Then Jae which also has proper companion quests resolving around her and only second to Yrliet's in quality and effort put into them, both in writing and design
Following her is Idira and Cassia who also have character development and proper quests through the entire game, but those mostly are rather simple and merely about killing enemies.
Kibellah is likewise similar to those two girls above, but suffers from being dlc character glued on top of existing game
Argenta is firmly at the bottom and only slightly above a generic mercenary, given that she functionally stops being acknowledged after Footfall. Even her cumrag's torture sucks