They must be bought ad the Colosseum shop first.

    Samurai Gladiator with Japanese weapons and armor
    Robot Gladiator with rusty robot gear
    Ella
    Mysterious Female Gladiator
    Venus
    Beast Woman with special silly gear
    Vivid Beast Woman with special sillier gear
    Oar (Attack 26, Defense 18, Weight 31, $6140)
    a big club, like the one used by Miyamoto Musashi in the film Samurai III: Duel at Ganryu Island (1956).
    Tuna (Attack 32, Defense 16, Weight 35, $12480) -a big fish to swing around, like an ax
    Stann Galea (Attack 19, Defense 31, Weight 26, $5400)
    a round helmet
    Galea of Mars (classical Greek style plumed helmet)
    Ikaro's Wing (sword)
    Blood-stained knife
    Crown (jeweled crown helmet)
    Beast's Hand (Beast Woman glove pugilist weapon)
    Vivid Beast Hand (colorful version)