(Based off the theory by MeliZbeauty)

Raise your hand if you think Volpina will be the fox miraculous holder. Raise them high, and scroll down

Further

Here we are. Welcome to 'Proof that Lila/Volpina is not the fox miraculous holder' level. Now, you might be thinking, 'what is this girl thinking? She has to hold the fox miraculous! That's why Hawkdaddy introduced us to her!' Yes, but Hawkdaddy introduced us to her as a villain. There are two people that can hold the fox miraculous: Alya and Nathanael. Alya could be an okay partner to Ladybug and Cat Noir, but she'd be bursting with excitement and not focusing on the akuma. Her role in the series isn't as a miraculous holder. It's as a best friend who's obsessed about Ladybug. So, it can't be her. Now to Nathanael. His personality is perfect for someone who can obtain the fox miraculous. Just picture Nath in a superhero costume that looks like a fox with his Evillustrator personality. Shy and sweet to cunning and confident. I like it. If you're still not convinced, let's take a look at the Miraculous box again.

(Insert pic of box later. Until then, scroll back up)

We see different symbols under the different miraculous'. For LB's earrings, there are spots. For Cat Noir's ring, there's a paw print. Now take a look at what's beneath the fox miraculous. Don't see it? Zoom in really close and you'll see a sign. A sign we see on one character. The sign of a French band called Manga. The one person who is made for the fox miraculous.

Nathanael.