Hidden Details: Cat Surprise

Welcome to the one-hundredth-and-forty-second episode of the Hidden Details blog!

Have you found some obscure reference or detail in this comic? A JoJo reference? A sneaky little Loss? A callback to a previous comic? Let us know what you've found in the comments! Every detail that has been found will be added to the list below. Once everything has been found, this comic will officially be marked with "all details found".

Link to the comic for your convenience

Please only comment with ONE hidden detail or reference!

There is ONE Loss, ONE Balthazar, ONE crewmate and TWO obscure retro characters. Bonus panels don't count.

1: Toteman pointed out the little yellow Pikmin sprout in the yard in the first panel, right behind Morgana.
2: Incineroar gives Pyra some attitude after she's surprised that Morgana can talk. I can't blame him, Tejayes.
3: The first retro character in this comic is Nathan Graves from Castlevania: Circle of the Moon. He appears as a little drawing on the closet in the third panel.
4: Someone made a little Fidough drawing as well, right under Nathan. Do you like the drawing, Zach?
5: Fun fact, VisionPlayer22: I had no idea Morgana doesn't like to be called a cat. His initial dialogue in the third panel was "I can do more than talk, you know".
6: If you zoom in on the letter Ryuji is reading, you'll notice it says the exact same thing that he's saying. Consistensy, Daniel Myhre, consistensy!
7: If you look closely at the envelope Ryuji is holding in the fourth panel, you can see the seal on the letter that was sent to the Phantom Thieves has the Crest of Flames, hinting at "B"'s identity... Good eyes, Generic Hero!
8: Yes, thanks for pointing that out, Jon Brouse! Pichu actually wears a Focus Band in one of his alternate costumes, so this isn't just something I made up!
9: There's a little blue Pikmin chilling in the potted plant in panel fifth panel, but The Human found him/her/them!
10: In the fifth panel, Pichu looks pissed. I was going for a "I thought I lost this, but it was HERE all this time?!"-look, Michael Ederer!
11: I'll count it, but to be honest... I can't remember why I changed Ryuji's "ZOMG" shirt to WTF in the fifth panel, Spirit of Gotham.
12: No you're right Trigger, Loss is in Zorro's belt in the sixth panel. It's indeed partially obstructed by the purple magic plant thing. Mistake on my part, sorry!
13: Yeah okay that's technically two Balthazars, Cendrail. But I count two identical Balthazars as one. He's on Zorro's buttons in the sixth panel!
14: Morgana heals 997 HP to revive Joker, indicating that he indeed had 1/999 HP left. Wait, shouldn't it have been 998 HP then?
15: The second obscure retro character in this comic is, fittingly, the protagonist of Persona 1. There's a portrait of him in the seventh panel, as pointed out by edmg7.
16: Ah yes, classic (and very high quality) jokes Sugma, Ligma and Candice made their way into this comic as book titles in the seventh panel, as pointed out by A Sad Fat Dragon with No Friends. I think I was a bit tired while drawing this.
17: Good catch, Lukas Wandler! The Smash house is apparently in possession of a double Arm Cannon Samus amiibo, which is worth a lot. It's on the nightstand behind Ryuji in the seventh panel.
18: I'm surprised it took this long for someone to mention Futaba's crewmate blood splatter in the seventh panel, Tommy Galvin!
19: The background in the final panel changes to the stylish red-and-black from the Persona 5 visual style. Also, Incineroar suddenly seems to hear Persona 5 music, in this case classified as acid jazz. Whether it's the battle theme or something else I'll leave up to your interpretation, Fighting Master.
20: And lastly, I have once again stolen the "To Be Continued" arrow from JoJo, as pointed out by Cameron Devera.

When I get back from my break, I'll reveal all the details that haven't been found. These ones are written in italic.