I'm afraid that applications aren't being accepted, even with the recent departures there's still a lot of PCs roaming around. That said, there are a few issues with your Character that you may want to consider changing if at somepoint a spot does become available.
For one, you don't get to choose your numbers now, that stopped once the story started and the Number holders were chosen. The only way to get numbers is to win them from a Rogue number holder. And a side note, those specific numbers are unavailable anyway so you couldn't use them regardless.
Furthermore, the backstory is illegal. Number cards essentially weren't a thing, at all, before the events of this RP. The story diverges away from Zexal. Furthermore, the voice that commanded him to seek out the cards is very, very vague. All supernatural forces in the RP are accounted for, so unless your character has a psychological issue, he can't be hearing those voices.
Just character-personality wise, I won't claim to entirely understand what this character may be, for all I know you could portray his personality well, but you say he is careful and independent but then you say his devotion is unrivaled? just in my mind those two concepts don't mesh well with a character and could hint at a sue-ish personality.
And this is more a joke than anything, what 15-16 highschooler has stubble? Dude was an early bloomer xD
Sorry if this is a bit presumptuous, offering changes to your character and all even though I can't let you in but I'll make sure to keep a note in case some more players drop out.