This is a RWBY x Kingdom Hearts follow-up to this. Just letting you know.

(After an incident in Wonderland, Sora returns to Traverse Town and tells Squall's party about his run-in with Weiss)

Rinoa: Team RWBY? Out there!?

Yuffie: Should've guess you'd run into them.

Sora: You know them?

Squall: They've been searching for the Heart of All Worlds to elimate an ancient evil that may or may not exist.

Rinoa: They've been fighting Grimm so long they've tried gathering Princesses for to wipe them out. Aside from that, they're pretty nice.

Squall: I'd steer clear of them. We don't even know where those Grimm come from, let alone if the witch they're talking about is real. For all we know, they're chasing a wild goose.

Stitch: (Jumps on Squall's head) Squall is just mad because their leader has a cooler gun-blade than he does!

Squall: (Glares at Stitch) I want to put you in the microwave so badly but I'm scared your weird alien biology will adapt to it and you'd escape with new heat powers or something.

Rinoa: (To Sora) We ran into them before, saw them in action even. You met Weiss already, but there are three others. Blake, Yang, and Ruby.

Squall: Long story short, if you see women with cat ears, a mechanical arm, or a red hood, run.

Sora: Cat ears?

Yuffie: (Holds up Stitch) You're in a room with this thing and met talking ducks and dogs, I don't think a woman with cat ears is that out of the ordinary.

Rinoa: I'm just surprised they're out searching in the Realm of Light. That's pretty far from home for them.

Sora: (Unsettled) What do you mean, where are they from?

Squall: Well, let's just say there's a half of this Multiverse you haven't seen yet and probably shouldn't see any time soon...

Yuffie: Yeah, that won't just make him ask more questions or anything.

Rinoa: They're, uh, from a realm of... Darkness.

Sora: WHAT!? THAT EXISTS!?

Squall: Yeah, steer clear of that place, okay?

Yuffie: Good thing you learned that hypnosis spell, huh, Sora? Might help ward off any other people you might but heads with.

Sora: It didn't seem to work on the Heartless or evil people. I guess that's a good sign...

(Sora makes his way through the Bayou of New Orleans, having gotten separated from two frogs, an alligator, and a firefly when a bunch of Grimm rose from the swamp)

Sora: They just keep popping up! Do you things ever get tired!?

Beowolf: (Growls)

Sora: I was being radical!

Voice from Between the Trees: You mean "rhetorical."

Sora: Thanks! Wait, what? (Just as Sora questions this, Heartless rise behind him) Oh come on! (Fights the Heartless as the Beowolf edges in on him...)

(To Sora's surprise (and relief), whoever corrected his grammar sends out a hooked cable of sorts into the Beowolf's back and drags it into the dark shadows under the trees)

Sora: Thanks, I think!? (Continues fighting the Heartless as he hears the Beowolf fighting... something...)

???: You can't let them scare you, it's what attracts them. (Fires a clean shot at one of the Heartless Sora's fighting)

Sora: I don't think a creepy voice talking to me from the darkness of a swamp is helping! (An Ursa Grimm rises behind him) Another one!?

(The source of the voice leaps out of the shadows, slashing at the Ursa with her blade before landing next to Sora)

Blake: Relax, Sora, you did a great job against them so far.

Sora: Thanks! Wait, how do you know my na-

(One fight later...)

Sora: Phew, that's all of them. Thanks, uh...

Blake: Blake Belladonna.

Sora: Blake! (Sudden realization) Blake... Uh... (Notices her cat ears)

Blake: My eyes are down here.

Sora: (Slightly nervous) Sorry.

Blake: Don't worry, Sora, a lot of people question it.

Sora: What are you doing out here?

Blake: Just making sure nothing eats you or your friends. Sorry for stepping in, but those numbers were getting ridiculous-

Sora's Brain: Okay, Sora, be rational. Don't get impulsive.

Sora: Hypnora!

Blake: Wha- (Her eyes fill with swirls as she smiles blankly)

Sora: Okay, that was probably the right way to handle that.

Blake: (Salutes comically) It certainly was, Captain-King-Emperor Sora! Perfectly reasonable!

Sora: (Chuckles a bit) Blake, you're with Team RWBY, right?

Blake: Right on the money! I've been a part of the team since my school days!

Sora: Okay, why are you following me?

Blake: Well, you see- (Shakes her head and snaps out of it) Hey! What are you-

Sora: Hypnora!

Blake: (Smiles as she falls back into trance) I was following you because your Keyblade could be helpful and also- (Snaps back out of it) Will you stop that!?

Sora: Hypno-

Blake: (Leaps out of his way and leaves a strange shadow in her place) Nope!

(Sora looks at the shadow, noticing its eyes are practically made of hypnotic spirals, spinning around and around)

Sora: ... (Finds he's stuck looking at the shadow)

Blake: Nice spell, but your strategy needs work.

Sora: ... (Nearly falls over, only for Blake to stop him)

Blake: I guess you already know now. You met my friend back in Wonderland. She told us about you and your sidekicks. Although she kinda forgot their names and just called them Duckman and Pure-Heart the Puppyfaced the whole time. Of course, you're not the only reason I'm here. I'm sure you realized that someone in this world is a pure-hearted lady who could cast a great light over this world.

Sora: ...Mama Odie?

Blake: (Rolls her eyes) Tiana.

Sora: That was my second guess.

Blake: No, it wasn't.

Sora: (Hangs his head) No, it wasn't.

Blake: I was hoping to see if you and her would be more agreeable once she's returned to normal and you seal this world's Keyhole. Although, I am curious how you knew whose team I was on. I doubt Weiss told you about me.

Sora: (Hesitates) ... S-Squall... Rinoa...

Blake: Oh, you've been to Traverse Town. Been there once. Never again. Let me guess, they said me and my team are crazy?

Sora: Sorta...

Blake: Figures, but I get that you might think that. But if you'll listen, I think we can show you why we're out here searching for that Heart.

Sora: You're from... Dark...?

Blake: Realm of Darkness? Yeah. You'd be surprised what kind of stuff lurks in there. But there's still people in there too. People worth protecting.

Sora: Oh...

Blake: Hm, Sora, I get you've got the greatest kind of weapon anyone can hope for, but I have to ask, where are your parents?

Sora: ...

Blake: Let me guess, erased with your world?

Sora: ...

Blake: Figures. Okay, listen, I want you to go find Tiana and the others and make sure they turn back to normal. I'll find the Keyhole for you to seal in the meantime. After all that's taken care of, bring Tiana to me and we can talk things out. If this goes well, we can revive your world and you can see your family again. Okay?

Sora: ...okay...

Blake: Great. (Pats him on the head as the hypnotic shadow finally dispells) I'm sure they'll be proud to see how brave their son is. (Disappears into the shadows of the swamp once more)

Sora: (Snaps out of his trance) Mom! Dad! Huh? (Looks around) So that was Blake... I... I should go find Tiana and the others...

(After a wedding that ended in Tiana and Naveen becoming human once more, Sora was ready to negotiate with Blake. Sadly, before he and Tiana could go to find her, someone else swooped in and distracted Sora while taking Tiana to parts unknown; with Naveen and the others urging Sora to find her, Sora meets up with Blake, clearly unhappy)

Blake: It's not your fault, Sora. (Sees he's worried) If it helps, she needs to be alive for her to open the door. So whoever took her likely can't kill her.

Sora: Nothing worse than that, right?

Blake: ... Uh, hey, I found the Keyhole. (Leads Sora to an old building, the one Tiana was planning to buy) With Tiana gone, you better seal it now. I think she'd like to have a world to come back to.

(Sora seals the Keyhole)

Blake: You did your best, Sora. Sometimes, you don't always win. (Sees Sora heading towards the exit) You know, I could bring you back to my team, we could help you find her and Alice, maybe teach you a thing or two?

Sora: Uh, I'll think about it, thanks. (Leaves rather quickly)

Blake: (Sighs) Squall, Rinoa, you better not let anything happen to that kid. You're the closest thing he has right now. (Blake gets a text on her Scroll)

Yang: How's your search for a housekey going?

Blake: He said no. And we lost Tiana too.

Yang: Dang. I'll keep an eye on this one. Not sure she's the one we're looking for.

Blake: Well, watch out, something out there is nabbing them when no-one's looking.

Yang: I'll try, but with the guards, the desert heat, and the princess running around with a tiger, this place is kind of bazaar.

Blake: (Sigh) Never change.

  With RWBY's fate uncertain because Warner Discovery is an ass, I figured I'd continue that little "Sora meets Team RWBY for the first time" bit in my Multiverse canon. I really like the whole "What You Are In the Dark" vibe this has, with Weiss and Blake's conscience keeping them from just trying to fully brainwash or manipulate Sora into a puppet.