Our story follows your character on the planet of Pandora (Avatar nerds, don't get your panties in a bunch) searching for the Vault, a rumored trove of glory that only opens every 200 years, though no one really knows what's in it. You can pick to be Lilith, the siren who is proficient in SMGs and elemental attacks, Mordecai, the hunter who rocks at the sniper rifle, Brick as himself, who can use the rocket launcher and shot gun like no tomorrow, and Roland, the soldier who likes to use combat rifles and shotguns. Along the way, you are guided by the Guardian Angel, who communicated to you through the ECHO communication device.
The charatcers, like the story, are just there. You have your character, who is like almost every first person shooter character: just a set of hands or a gun. Along the way, you meet various enemies, such as 9 Toes (he has three balls too!) and Commander Steel, and Sledge (p.s. He's not your friend.) The comical relief character Clap-Trap is always present, but he doesn't really add much to the story except at the beginning. There aren't many "good guy" characters, but the bad guys make the game worth while.
Overall, for anyone that likes to shoot stuff and not too much story, then this is the game for you. Sure, Call of Duty has all that, but Borderlands does it in a fun fashion and with a random gun generator hat can generate over 17 billion guns that provides for a lot of versatility. If you're ready for a bunch of guns, adventure, and pure hack and slash shooter, then head down to your local game store or steam and get it.