Hidden Details: Big-O-Blaster-Chief

Welcome to the one-hundredth-and-ninth 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 ONE Loss, TWO Balthazars and NO JoJo references. Bonus panels don't count.

1: Piranha Plant is getting a lot bigger! I'd say he's going through puberty right now.
2: Hahaha yeah, those are just some buttons, Trigger. But you're right, there's a Pikmin peacefully sleeping in the pot in the first panel.
3: Isabelle is wearing her fall sweater! Glad you noticed that, Jon Brouse.
4: Yep, Olimar is still a plant. You can see his leaf in the first panel. We'll probably have to wait for me to forget about this and draw his regular antenna, FoxdocDylan.
5: Isabelle is apparently wondering if Greninja can be brought into Sinnoh, as seen on the board and as pointed out by edmg7. Little foreshadowing there.
6: Yep, Isabelle originally wrote Hisui but crossed it out and replaced it with Sinnoh, since Sinnoh was originally called Hisui. Good catch, Tejayes.
7: Isabelle also already wrote down some options that could help revive Pokémon, like a Pokémon Center, Revives, Xerneas and Arceus. Wonder which one I'll end up picking, Erin. (Not that I know myself, I'm making this all up as I go)
8: Since I forgot Balthazar last week, I put two of them in this comic. The first one is the very first Fake Monday fakemon Baltaban, appearing as a scribble on the board in the first panel. Glad you noticed him, Zanreo!
9: There's also a... Dicklett with two Poké Balls scribbled on the board, as pointed out by PLANTMAN.
10: Yep, the fighters apparently have to remind themselves (just like I have to) that Link is still locked in that shrine in Hyrule, as you can see on the board. Good eye, Put 9-Volt In Smash Bros Please.
11: There's some subtle nods to friendships/comradery going on in this comic. Both Shelby Kinkead and Zach pointed out a few: Master Chief revives "his friends" Banjo and Kazooie because they're both Microsoft IP's, and King K. Rool, Donkey Kong and Diddy Kong are visibly involved in this plot because they're all Rare buddies!
12: Correct Aris! The dialogue between Gruntilda and Chief is a reference to his "Mind what you're doing x" quote!
13: There's a little crewmate on the B.O.B. screen in the third panel. Sharp eyes, Cameron Devera!
14: Correct John Hattan, apparently Master Chief has logged into the B.O.B., since his Spartan name is visible (John 117) on the screen.
15: Yep, this week's loss is visible on Master Chief's wrist in the fourth panel. You have had the honor of finding it this week, TaNi!
16: God, I had forgotten about that little 420 in the fourth panel. But you're right Noah, it's there.
17: The second Balthazar is visible in the fifth panel, in the background behind Master Chief, looking on from the top of a cliff. You found him, Luke!
18: Once again Phloxiana points out a wholesome detail. Or should I say materialistic detail? Anyway, Wolf is very happy to have his Wolfen back in the final panel.
19: Ah, yeah, I hadn't counted this one, but I guess I should. I replaced "guest starring" with "thank you" in the revived Smash fighter chart to honour Chief. You're absolutely correct, Pandocula.
20: I'll give you a point for this one, GainergettingHuger, because it's an interesting tidbit: I have never played Banjo-Kazooie so I had no idea Gruntilda always rhymes her scentences. Still, it worked in this comic because she was interrupted by Chief's assault rifle.

Many details on Isabelle's flip-over, but please remember to comment only one!

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