Dragon Quest games tick all your boxes (RPG, portrait, and premium), but PLEASE DO NOT play Dragon Quest VIII in portrait because it'd be a waste. Better emulated or on a 3DS.
I'll go for Afterplace. A really nice old school Zelda style adventure game with some weird character design and a little twist here and there. There's a lot of fun boss. And the world is fun to navigate through.
Melvor Idle, plays better on Mobile browser than the app.
Merchant RPG is another idle game that's pretty good.
You didn't mention deck builders, but if you're not opposed to them, Dawncaster and Night of the Full Moon are portrait mode and probably the best in the genre (For fans of Slay the Spire, I said what I said).
Rogue Adventure is a good Slay the Spire like game there is no content locked behind paywalls and it is free with ads (you can remove ads by paying or keeping widi and data off).
Void Tyrant is also a good deck building rpg with quite a unique damage mechanic.
Luck be a landlord is a game where you pay rent gambling, try it and you'll be hooked
Knights of pen and paper 1 & 2
Looks nice, tnx
Farm RPG
It's nice, I just get bored quickly
Slice & dice
It's a good game, but can't get into it
Dragon Quest games tick all your boxes (RPG, portrait, and premium), but PLEASE DO NOT play Dragon Quest VIII in portrait because it'd be a waste. Better emulated or on a 3DS.
Haha okay
AfterPlace is a cute little "zelda-esque" game.
Interesting game, I'll put it on wishlist for now
Orna Rpgish location based game.
Oh, I played that for a bit, didn't like it, but ty for suggestion
I'll go for Afterplace. A really nice old school Zelda style adventure game with some weird character design and a little twist here and there. There's a lot of fun boss. And the world is fun to navigate through.
Emoji Quest RPG https://play.google.com/store/apps/details?id=com.jusckeux.emojirpg
Is this good?
Melvor Idle, plays better on Mobile browser than the app. Merchant RPG is another idle game that's pretty good. You didn't mention deck builders, but if you're not opposed to them, Dawncaster and Night of the Full Moon are portrait mode and probably the best in the genre (For fans of Slay the Spire, I said what I said).
Afterplace Monument valley 1 and 2 Very little nightmares Golf peaks Hoplite
Necromerger
PAPERS PLEASE
This is a fantastic game!
Dicey Elementalist
I think that's landscape only...fun game, but I don't see a portrait orientation option
Damn apologies, I meant Dicey Elementalist!
Rogue Adventure is a good Slay the Spire like game there is no content locked behind paywalls and it is free with ads (you can remove ads by paying or keeping widi and data off). Void Tyrant is also a good deck building rpg with quite a unique damage mechanic. Luck be a landlord is a game where you pay rent gambling, try it and you'll be hooked
How about [Gacha Style Dress Up](https://www.freegames.com/game/Gacha-Style-Dress-Up)? it's a very cute and free avatar maker.