- One with an overarching plot, with a clear direction and an antagonist to defeat
- One that is in an - at least mostly - sci-fi setting that is original, but reminiscent and relateable to other things as a point of reference and understanding, and is well-defined and explained to me. 
- One that has 'real robot' type mecha in it - i.e. similar those in Gundam or Macross. Bonus points if, like Macross mecha, they transform.
- One where I can play a non-human character, but not necessarily that doesn't have humans at all in. I like settings with multiple species/races. Especially anthro/furry ones, or synthetic/robotic sapient characters. 
- One that is mostly serious, with grand, epic plots, good versus evil, huge battles and great scope, where our characters are the thing on which victory or defeat rests. Going from being underdogs or not even worthy of note, to being the biggest damn heroes in the 'verse.
- But also where there are moments of levity, humour, bonding, romance and reflection on all that's happened and happening. Pathos and emotion, as well as epic set-pieces.
- One where the player character group are a bunch of varied personalities, that, sure; might not always get along. But they're actually friends and a 'found family' of weirdoes that always have one anothers' backs when the shit goes down
- One where being heroic, noble, and moral isn't a dirty word or smirked at and seen as 'naive' or childish.
- One where everyone gets a spot in the limelight, and each characters' backstories and histories are woven into the narrative as it progresses, so that everyone gets a chance at a proper ending and closure for their characters
- One where I can play a grown-ass adult, and not a kid, and not in a school, or an Isekai. Or that isn't inspired by terrible MMORPG mechanics. 
- Escapism. Not rigid, ruthless adherence to realism. But enough grounding to be relateable and have limits - and then, when something exceeds those limits, it's worthy of note and something to be explored and understood.