Hidden Details: On Sephiroth's Left

Welcome to the one-hundredth-and-forty-sixth 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 ONE obscure retro character. Bonus panels don't count.

1: The museum banner in the first panel announces the current exhibition on display: Bringing Despair to the Smash House. It's accompanied by a little Sephibutt. Good catch, HaydenEatsShrimp.
2: You're right, Generic Hero. Pyra apparently missed the sign right outside the museum that mentions you can only go in topless.
3: I'll take your word for it, edmg7. Friendly Discord members helped me with Persona 5 lore since I haven't played the game, but apparently the museum Morgana mentions in the first panel is Madarame's. It's the second palace the Phantom Thieves infiltrate in Persona 5. (This is a direct quote from edmg7)
4: The security guards in Sephiroth's museum have the same hair color, belts and nude upper bodies as Sephiroth himself.
5: In the third panel, we can spot one of the many pieces of art that are on display in Sephiroth's museum of bad deeds: a painting depicting him traumatizing Cloud from one of the first comics after he was added to Smash. Cameron Devera spotted this one.
6: Tifa covers Squirtles eyes in the third panel. Apparently he is the "child" Pyra is talking about, Daniel Myhre.
7: Part of Balthazar's head is visible next to Squirtle in the fourth panel. Thanks for finding the boy, Trigger!
8: The crewmate is visible as a silhouette in Sephiroth's army in the fifth panel, as mentioned by Jack!
9: The wyvern antlers form loss, as pointed out by Miz Kriss. Maybe they're bred for that particular shape of antlers.
10: Yeah, I do consider Etika being part of the hero army a hidden detail, Jeffrey Solis. May he rest in peace.
11: I did intentionally leave Edelgard out of this picture, Delete This. Partly because I like messing with Edelgard stans and partly because I genuinely think she's a villain, lol.
12: The Acolytes of the Supreme Sun (A.S.S.) reappear in this comic. They're all wearing an A.S.S. badge, too. Sharp eyes, Zanreo.
13: All playable LocoRoco from both the original game and the second game are visible in Byleth's army. There are six in total!
14: Sephiroth's has banners with a Sephibutt on them, and Byleth's army has banners with the Smash logo, as pointed out by Pandocula.
15: There's a hulking silhouette visible behind Doom Slayer. This silhouette belongs to Doshin the Giant, who I consider the retro gaming character this week. Good catch, law_guy!
16: Seems like a certain Saiyan showed up as well. His hair is visible right behind Cynthia, as mentioned by Percylegallois. I just HAD to include the #1 joke character in Smash history.
17: The Chibi Robo in Byleth's army is on fire, as a reference to the infamous Nintendo tweet that included the same picture back in 2018. Glad you got that reference, Spirit or Gotham!
18: As a little joke to their morally grey status, I put a Rabbid both on the villain army and the hero army. I hope that answers your question, Fighting Master.
19: Another JoJo "To Be Continued" arrow at the end, as pointed out by Joshua Eddleston. I think we'll be seeing this thing a few times more in the upcoming weeks.
20: The comic's title is a reference to the quote from Avengers: Endgame, where Sam Wilson tells Steve Rogers "on your left.", when he's about to arrive with a huge army of heroes.

PSA: not every character in the army is a hidden detail

Next week, I'll reveal all the details that haven't been found. These ones are written in italic.