Arguably, Strong Sad. Sure, he's a fat, well-read elephant. Yeah, he is smarter than half the cast. But the only one who can beat him up is Strong Mad, and several times mentions that Strong Bad is no threat to him. On top of that, he has beaten Coach Z to an inch of his life, single-handedly stopped the invasion of King Bubgonzola, strategically beat down the resistance in Strong Badia the Free, is a high-ranking officer in the Homestarmy and was able to survive being run-down by a truck and having it parked on him with only short-term damage. Plus the ways he gets back at Strong Bad, including saving snowballs in the fridge since he was 8 just to pelt him with them, and in Baddest Of The Bands, tazing him repeatedly.
Pom Pom tops this. He is the Only Sane Man, and has made many a blockbuster. But don't tick him off, or he'll five-hit combo you into next week.
Blake Belladonna strongly favours burying her face in a book than conversing with others, and is even shown reading during her lunch hour, which she shares with the rest of her team and Team JNPR. She was able to get into Beacon, an elite school designed to train warriors, with no formal combat education. While most applicants spend years training at combat school in preparation for the entrance exam, she grew up outside the protection of the kingdoms and had to learn to fight to survive.
Doctor Oobleck is not what Team RWBY expected when they were told they'd be shadowing a true Huntsman. Oobleck is a history teacher, and spends most of his time on the mission taking samples and notes while the girls fight off Grimm. He also admits that he really sees himself as more of an academic than a warrior. When push comes to shove though, he whips out a flamethrower/club and begins single-handedly trashing a squad of mecha that the students have only been able to take down in teams.
Oobleck: As a Huntsman, it is my job to protect the people, and although I am capable of doing it with traditional weaponry, I believe I can make a much larger impact if I do it with my mind. As a teacher, I am able to take knowledge, the most powerful weapon of them all, and place it into the hands of every student who passes through my classroom.