Must be pretty obvious at this point, but if we look at Kaguya's and Wodin's chants, when they summon their aces, and then we look at Andrea chant:
Kaguya - You are the seventh messenger!
Wodin - This third star appears with a tempest.
And Andrea - The sixth angel descends upon us...

We can guess, that she's the last member of Seven Shadows.

gonna be honest, I didn't bother counting and thought all 7 shadows were revealed

She got too cocky with her win streak. lol

Come on don't bully the loli dats a fully fledged crime man

ah yes, Nibiru and Final Countdown's lovechild.

Let's be honest now. This girl's entire character is entirely based on a hypocrisy: Wodin said "she loves truth", but she cannot be honest and admit that she wants to be with her friends or to the idea that she hates being alone or that she is too shy to approach other players in her real form - this is bullshit! You either live by the truth by admitting everything straightforwardly or you don't bcs you don't want to be true to yourself, end of story! Also, it is kind of unbelievable to give the background of a strategic and logic character to a "girl" - their entire gender is based on emotional thinking and illogicality lol

Poor shion. The guy flexed so hard by throwing a meteor at his opponent lol. Since "End of the World" gets reduced to 0 at 13th turn, you can also use it in a control deck as win con. Overall, it's spell version of "Sorcerer of seven forces" but harder to pull off

A fello' I don't wanna meet.