I saw people were creating same question like this before. My answer will Ironwood, Pyhrra, Adam, Raven, Winter and Penny. Also recently I liked Watts.

Neopolitan 100% ahah

Blake belladonna she's a real inspiration to thoses who want to bring to peace to other races like martin luthor king jr

After the final episode, Winter became one of my favourites.

I really like Jaune, Oscar, Neo, Winter, Blake, and Yang

For me it's Jaune, Oscar, Ozpin, Qrow, Ruby

For me its:

Qrow Branwen

Sun Wukong

Mercury Black

Lie Ren

Ruby Rose

Weiss Schnee

Winter Schnee

Yang Xiao-Long (The times where BLmB isn't shoved down our throats)

Oscar Pine

Ozma/Ozpin

Marrow

Velvet

Raven Branwen

Oh yeah Raven's probably my favorite adult in the series apart from Qrow

Mercury, Roman, pre-V8 Ironwood, and Neo are easily my top 4, and they blow every other character out of the water for me personally. I'd also slide Adam in there, not for what he is, but because I just see so much wasted potential with him.

I really liked Yang and Blake’s development in volumes 1-6, sadly there really hasn’t been anything in volumes 7 and 8. Hoping for volume 9