In most RPG parties there is a fair amount of variety to account for different tastes amongst players. This is not the case in FFXIV, where it is oversaturated with blond/white haired elezen and miqote. There's usually at least one "big guy" for lack of a better phrase whether they be Qunari like Iron Bull in Dragon Age, Barret in FFVII, etc.
What I want to see in such a character is for them to not be designed in a way that purposefully makes them ugly, whether through spite for the race or larger types in general, and for them to bring something compelling to the story. Hopefully it'll be something more impactful than the feelz rollercoaster that a lot of people fell for in Endwalker and have something in the way of strong character development and high personal stakes. Again, see the above character for some pointers when it came to his story arc, his body not looking like it was made out of a marshmallow, and what draws his fans to him.
Someone who we can enjoy watching them overcome adversities, and potentially succeed in accomplishing their goal. Preferably with a conclusion that doesn't involve fakeout deaths. Though I suppose if the main party will be immortal, Roegadyn/Hrothgar enjoyers will be able to benefit of having 10 years worth of the character just like everyone has had to forcefully tolerate 10 years of Y'shtola and the twins.