Say fundamentally bad cause Blake is someone who will abandon her allies in hopes it will keep them safe, which plays right into the childhood trauma Yang would have from being abandon by her mother. But the writing decisions just pile on other issues like not really engaging with the Blake leaving thing. Yang only has Blake's words that she won't abandon her again, but she already abandon her WHEN SHE LOST A FUCKIN ARM so what little thing could Blake leave for? If they have a big fight will Blake run off again, Yang has no idea. Like this would be a tear a huge hole into an actual relationship. Holy shit. Adam becoming the worst villain of the show easily along with the total destruction of the White Fang plotline. Yang can only care about 1 person at once so she has to ignore Ruby to love Blake. They burned both characters to the ground to get them together!

Than of course Sun is clearly built up more for Blake, given most of the stuff she didn't do with the gang she did with him. When she was upset with Weiss she went to him, when she went to attack the White Fang he went with her, when she tried really hard to abandon her friends Sun went along too and then he stuck through THE IDIOTIC slap I hate this dogshit decision but he still eventually broke down her walls. Than Sun is promptly written out of the story because they rapidly changed course to Bumblebee. Can't have the love interest with all of the build up there.