| Luca (ルカ) | |
| Kana | ルカ |
| Romaji | ruka |
| Japanese | Ru-ka |
| Original Name | Leanarda |
| Alias | Lu-Lu |
| Role | The Second Key of Destiny |
| Gender | Female |
| Alignment | Good |
| Weapon | Keyblade (Kingdom Key; Star seeker & Innocent Sign) |
| Attribute | Ice (氷 Kōri) |
| Status | Alive |
Luca, the Second Key of Destiny is a Nobody of Lea and was Rank XIIIll within Organization XIII.She has the ability to use the Keyblade, and wields Galaxy, using it to direct rays that strike opponents with great power. She also commands the Samurai Nobodies along with Roxas. She is strongly like Nova, as Xigbar reveals in the Secret Reports.
Luca was also one of the mysterious hooded figures in "Another side, Another story..." and "Deep Dive". Later in this same game, Luca also acts as a minor antagonist. In Kingdom Hearts 358/2 Days, Luca is the second main protagonist.