At this point in time, Nintendo is no stranger to mingling with third-party studios. They've even gone so far as to allow them to make new installments in the company's franchises, such as Koei Tecmo's Hyrule Warriors and Brace Yourself Games' Cadence of Hyrule.
Clearly, their crossovers have been massive since those games have had a positive reception and have sold well too. So, it makes sense for Nintendo to experiment further with different teams.
Given the amount of franchises that the Japanese publisher has and the sheer variety of experience many developers possess, the possibilities are endless. Let's take a look at some ideas.
Firaxis Games are known to be the makers of Civilization and XCOM, two of the most popular strategy games to date. They seem to fit the bill for a XCOM-esque Fire Emblem game.
Perhaps they could introduce character customization and loadouts like in the sci-fi strategy RPG series. Unique abilities for each Fire Emblem hero could further improve effectiveness on the field.
Though it would be hilarious to see a sword strike miss at 95% chance, wouldn't it?
Larian Studios are renowned for the 2017 RPG Divinity: Original Sin 2 as well as their upcoming game, Baldur's Gate 3. So, they're definitely not going to fall short of handling a fantasy IP like Golden Sun. Nintendo's JRPG franchise has followed mostly traditional roots, but maybe Larian's expertise with Western RPGs can pave the way for a new way to play Golden Sun.
The elemental magic system of DOS2 could add further depth to the existing Golden Sun combat. The summons would be great to see in a DOS2 format. The studio has dabbled with turn-based combat, so regardless of them keeping it a party-based JRPG or reskinning it as Golden Sun:
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