Well, you see, Roxas is a pretty unique character in the Kingdom Hearts series. He’s actually the Nobody of Sora, who is the main protagonist of the game. But what makes Roxas even more special is that he possesses his own heart as well as Ventus’s heart.
Now, in the Kingdom Hearts universe, the Keyblade is a powerful weapon that can only be wielded by those with a strong heart. Sora, being the original Keyblade wielder, can use his Keyblade to its full potential. But because Roxas is Sora’s Nobody, he also has the ability to use a Keyblade.
However, when Roxas first appears in the game, he only wields one Keyblade, which is known as the Kingdom Key. This is because of the existence of another character named Xion. Xion is a replica of Sora created by the Organization XIII, and she also possesses the ability to use a Keyblade.
Because Roxas and Xion share a connection through Sora’s memories and hearts, they cannot both use their Keyblades at the same time. This is why Roxas is initially unable to use his Synch Blade, which allows him to dual wield Keyblades.
But here’s where things get interesting. As the story progresses and Xion’s true nature is revealed, she sacrifices herself to restore Sora’s memories. This event triggers a change within Roxas, and it awakens his ability to use the Synch Blade.
So, during Roxas’s assault on The World That Never Was, he finally activates his Synch Blade and begins wielding two Keyblades at once. It’s a pretty epic moment, I must say.
In terms of gameplay, having the ability to dual wield Keyblades gives Roxas a significant advantage in combat. It allows him to unleash powerful combos and deal massive damage to his enemies. And let me tell you, it feels absolutely amazing to pull off those flashy moves and decimate Heartless left and right.
But beyond the gameplay mechanics, Roxas’s ability to wield two Keyblades also symbolizes his growth as a character. It represents his acceptance of his own identity and his determination to fight for what he believes in.
So, in conclusion, Roxas can wield two Keyblades because he is the Nobody of Sora, who possesses his own heart as well as Ventus’s. His ability to use the Synch Blade is initially suppressed due to Xion’s existence, but her sacrifice awakens this power, allowing Roxas to unleash his full potential as a Keyblade wielder. It’s a pivotal moment in his journey and adds an extra layer of depth to his character.