Here are how to get the unlockable challengers for the Battledome. Those that are gotten when you start an account are not listed.
| Unlockable | How to Unlock |
| Advisor Broo | Random Event while playing Dice-A-Roo |
| Balthazar | Keep refreshing at http://www.neopets.com/halloween/index.phtml |
| Black Pteri | Random Event |
| Brain Tree | Finish his Quest in the Haunted Woods |
| Cave Chia | Keep refreshing at http://www.neopets.com/prehistoric/painting2.phtml |
| Chiazilla | Keep refreshing at http://www.neopets.com/water/index.phtml |
| Commander Garoo | Keep refreshing at http://www.neopets.com/space/index.phtml |
| Count Von Roo | Random Event |
| Edna | Finish her Quest in the Haunted Woods |
| Ghost Lupe | http://www.neopets.com/neohome.phtml? |
type=neighbourhood&location=0&street_name=4&street_number=131 |
| Grarrg | http://www.neopets.com/prehistoric/townhall.phtml |
| Jelly Chia | http://www.neopets.com/evil/showcreature.phtml?pos=16 |
| Kasuki Lu | Buy a ''Kasuki Lu'' trading card and click on it once it's in your inventory |
| Kauvara | http://www.neopets.com/neopedia.phtml?neopedia_id=9 |
| Koi Warrior | Keep refreshing at http://www.neopets.com/water/index.phtml |
| Lava Ghoul | Random Event |
| Magnus the Torch | http://www.neopets.com/prehistoric/volcano.phtml |
| Meerca Henchmen | Keep refreshing at http://www.neopets.com/desert/tr4pd00r.phtml |
| Meuka | Use a Ferocious Negg, Random Event, or Wheel of Misfortune in Deserted Fairgrounds to give your pet Sneezles of Neoflu; then visit Quick Ref |
| Mummy | http://www.neopets.com/halloween/mummy.phtml |
| Pant Devil | Random Event or have him steal an item in the Wheel of Excitement in Faerieland |
| Plumbeard | http://www.neopets.com/pirates/academy.phtml?room=110 |
| Ryshu the Nimmo | http://www.neopets.com/neopedia.phtml?neopedia_id=13 |
| Sabre-X | Random Event in Tryannia |
| Shadow Usul | Random Event |
| Sidney Win a level 3 or higher prize on one of his scratchcards |
| Snow Faerie | Finish her Quest on the Top of Terror Mountain |
| Space Faerie | Redeem a Rare Item Code at the Space Station |
| Spider Grundo | http://www.neopets.com/evil/showcreature.phtml?pos=15 |
| Tax Beat | Rand Event where he takes 10% of your Neopoints on hand |
| Tekkitu the Witch Doctor | Take a Tiki Tour on Mystery Island |
| The Snowager | Have him blast you at his cavewhen you try to wake him up in the Ice Caves |
| Tiki Tack Man | http://www.neopets.com/objects.phtml?type=shop&obj_type=21 |
| Vira | Random Event |
| Zafara Rogue | Keep refreshing at http://www.neopets.com/art/index.phtml |