Those of you who watch (and love) “The League” recognize Stephen Rannazzisi as Kevin, the character who once suffered from a “fear boner” and got maliciously stalked by the nefarious Bobbum Man. But Rannazzisi’s comedic chops go beyond Kevin’s constant humiliation. Much of the dialogue on “The League” is ad-lib conversations, jokes and mockery, and Rannazzisi more than holds his own with a cast that includes Paul Scheer, Jon Lajoie and Nick Kroll. He’s even funnier on stage. Rannazzisi mixes sarcasm with a friendly bro vibe that comes across as a snarky, yet approachable brand of stand-up.