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The woodland critters? Oh, jeez. I don't even wanna imagine what kind of crap they'll pull on Remnant. I think Salem would find them kinda ridiculous and insane.
Favorite Ace-Op: probably Vine. Keeps a level head throughout the entire show, unlike the rest of his allies. They are driven by their emotions, but Vine is driven by his own sense of logic and sees that trying to reason with RWBY isn't a stupid option.
Least favorite Ace-Op: tie Marrow. While I can see Marrow as the new soldier who is being adjusted to war and suffering because of it, his emotions and doubt can be seen as a weakness. And I feel it will lead to his downfall. Which is a shame, because I feel there's potential with him.
Penny would definitely help Fives. She would not only help him do research, but help him fight as well. That would actually increase their chances of survival and success.