Luna is Leo's younger twin sister. She bears the Hand Mark of the Dragon and possesses the ability to communicate with Duel spirits, especially the ones that act as her guardians like Regulus and her ace monster Ancient Fairy Dragon.
How to Unlock
Once you win 100 Duels using Leo, Luna unlock missions appear. Complete all the missions to unlock Luna as a playable character!
How to get
Twins Together Can be used when your LP is 1000 or below. Add 1 "Double Ripple" from your deck to your hand. This skill can be used once per Duel.
Level Reduction Reveal 1 monster in your hand, then target 1 face-up monster on your side of the field; that target's level decrease by the Level of the revealed monster. This skill can be used once per Duel.
Field Exchange Can be used when your LP is 3000 or below, Place 1 Field Spell from your hand to the bottom of your deck, and draw 1 card. This skill can be used once per Duel.
Field Restock Can be used when you have 3 or more Field Spell cards in the Graveyard. 1 random Field Spell in your Graveyard is added to your hand. Then, shuffle other Field Spells in your Graveyard into your Deck. This skill can only be used once per Duel.
There is no way to know, you just have to grab your Leo and start playing auto-duel with him 1 by 1, legendary duelist appear fast in duel world as well and same goes for the vagabond; if you do this, Luna's unlock missions will appear soon: I took a day to me... (I also played against some lvl 10 LDs at gate!).