Finished Volume 4 after forgetting it had come out lmao.
I liked the Nora and Ren stuff, it was nice. I feel weird that Weiss' butler having his weird eye/voice changing thing never got explained though. Qrows semblance is cool as fuck, if not depressing.
My absolute favourite part of the entire volume was Blake's face after "She's definitely above average!". Fucking slayed me.
I also really enjoyed that Yang did the rational thing and used the arm. I was scared the volume would end with her still being unconfident and chilling in bed.
Most of all in this volume, I feel that the choice to cut back on elaborate fighting in favour of character and plot development is something that is appreciated, but should have happened in volume 2.
I might have missed it, but was Neo absent from every episode in volume 4? I found it odd.
A close favourite moment of the whole show, never mind just Volume 4 is Kali being caught eavesdropping on Blake and Sun having a heart to heart.
As for Klein - whose surname is Seiben but I don't think they actually say it in Vol 4 - translates from German (Weiss's and the Schnee's mythological area of origin) to mean 'Little Seven'. Weiss being 'Snow White' makes Klein her seven dwarves, that's why his irises change alongside his personality. It was a neat idea, and I like the guy, but it has been lost on too many people to say it was a good idea for a character design. Regardless, that's what that stuff was alluding to.
As for Neo, no she didn't appear in this at all. It's rumoured, and I stressed rumoured since any and all confirmation RT staff ever give out in panels is nothing short of fan teasing to be taken seriously, that she'll reappear in volume 5. Given how they went on in the WoR video on Mistral there is a more complex black market web than in Vale, so a likely place she'd run to after Vale is attacked. White Fang and Cinder seem unconcerned in keeping up appearances there, so likely there aren't any decent jobs for career criminals like Neo.
Edit:
As an aside on Neo, don't forget Torchwick and her were never ever meant to be of any significance. The Vol 1 DVD commentary, plus a bunch of other sources point out Haddock's charisma right from the first epsiode cemented him into the plot of Volumes 1, 2, & 3. Originally, the heist at the store, the battle at the shipyard, the White Fang rally etc were going to be given to different characters as a way of giving the show a wider variety of easily disposable villains. However, Torchwick already ticked a lot of boxes given how easy it would be to write him into being an opportunist who stuck around with the real villains.
By proxy, I believe it is the Volume 2 DVD commentaries (both 1 and 2 have Monty on them if you want to find somewhere to listen) wherein weeks before Neo's first appearance, she was actually designed on an inspiration Monty(?) got from a fan at a convention. The fan was a girl who cosplayed a gender-swap Roman Torchwick and the concept blew his mind. I'm taking it they had wanted to give a bit more variety to the White Fang grunts and thus one (presumably the butch guy who fights Weiss on the train) will have been Torchwick's lackey, but once he thought up a female counterpart, that was it.
She's fantastic, don't get me wrong, and I think RT are idiots if they don't
actually put her in the show again given how ambiguous her fate in Vol 3 was, but she's by no means meant to be a central figure in the show, outside of being a fan favourite.