Hidden Details: Everyone is at the Beach!

Welcome to the forty-fifth 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".

The Patron who has found the most Hidden Details at the end of the year might win something nice... We still need to do the big reveal of 2019's winner, but it's happening very soon!

Please only comment with ONE hidden detail or reference!

There is NO Loss, ONE Balthazar and ONE JoJo reference.

1: Sakurai is working in the background of the first panel, trying to figure out who to add to Smash next. Doom Slayer, Geno, Crash Sora and Dante are shown as options. This is based on a recent popularity poll I found, so these aren't necessarily my picks. Found by Marwan Abunara.
2: Yep, Luigi has a W on his shirt, which doesn't stand for Wario, but for Winner! This is, of course, a reference to the Luigi cap description in Super Mario Odyssey. Glad you knew, Put 9-Volt In Smash Bros Please.
3: Yes, the beach is called Fenne-sur-Vice beach, which doesn't mean anything of itself, but it sounds like Fanservice Beach. Good eye, Zanreo.
4: Simon is wearing a little cross because he is a good Christian
5: Captain Falcon is wearing a book titled 'Knees Through the Ages', as a reference to his forward air attack.
6: Hahaha yes, Snake's sexy little Speedo is indeed a reference to one of his alternate costumes, John Hattan
7: Glad you're always there to find Balthazar, Phloxiana! He is indeed... in between Wii Fit Trainer's... legs.
8: Hm, there's indeed a heart with 'JoJo - Erina' heart carved in the tree. I'll give you both a point for that, Josh Morgan and Screen Name.
9: I was afraid no one would notice, but yes, Peach and Yoshi are indeed building a replica of Peach's Castle (Super Mario 64) in the final panel. Thanks for noticing, Sean
10: In the background of the final panel, Greninja and Squirtle are wondering what the hell Villager is doing with his fishing rod. Nicely found, Zach.

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