I like to see your take on machoke feet pics. Maybe looming the viewer to show off his sole over them <3

what about a portal/modular thing with gouhin?

Always been a Bowser fan, and he's got such nice, meaty stompers!

What if you did your Polar Bear OC (I don't remember his name :0) but as a construction worker? With the big work boots, worn out socks, the white muscle shirt, hi-visibility jacket, and jeans! I think he'd fit the outfit pretty well! <3

Oh or maybe Bill from Beastars? You drew Riz from that really well, and you draw tigers like Tony the Tiger amazingly well too! <3

Kumatetsu sniffing some smelly socks would be nice to see personally.

October is coming up soon, could go with a buff ghost-type pokemon haunting a gym locker room with some smelly feet/paws

death and scarlet panther (puss in boots) maybe puss got in over his head and gotten shrunk by the Alice in wonderland eat and drink me foods

Machamp and Urshifu (Pokemon) Herba Mytica, Dynamaxing, totem stickers there are a lot of ways for Pokémon to become huge which makes foot activities easy

Leomon and Ogremon(Digimon) they could encounter a glitch so thier weight stat is height instead so the more they defeat the bigger they become

Jackie oakes and Thailog (Disney) both have magical artifacts in thier series that make you bigger and stronger (Jackie has the talisman of Anubis and Thailog has the eye of odin) so feet shenanigans ensue

definitely bowser

I think it could be interesting if you could do polar patroller
Having him tired or resting after a long battle Royale match
Laying down with him paws up all sweaty and dirty. If you want you could add socks since you draw super well too

Clay Calloway from sing 2 with a micro stuffed in his shoe during a performance.

Leomon on a run, micros underfoot and marinading in sweat.

A micro getting casually stepped on by a gym goer that pulls on socks a moment later for a long, intense workout

I'd like to add my support to the aforementioned Leomon, Clay Calloway and Ogremon suggestions.

Especially Ogremon since he doesn't get enough love in feet and macro. I'd especially love a macro pic of Ogremon.
Leomon was part of the impetus in making me a furry (and rekindling my love for macro/micro and feet) but!

Urshifu and Machamp are fine too as previously mentioned, but you're free to also make more Machoke pics.

Legoshi from Beastars wearing boxers briefs with red heart print and stinky socks

Have you ever drawn Odokawa or Kuroda, from Odd Taxi?
I give you a little suggestion, while they're changing in the room, the view of sole can be seen.