I don't think there's a catch-all answer to that. Different people like different things - and that includes character types and styles of RP. Some will want slice-of-life stuff, some will want gritty intrigue plots... and different types of characters fit those molds better than others. Asking for a list is likely going to give you a lot of conflicting aspects that might not mesh well at all.
And even if there was a list of "perfect traits" to give someone to make them likeable and attract RP, that doesn't mean that you'll have fun playing that sort of character. That's why it's most important to play something you yourself feel comfortable playing and have fun with. Balmung has a lot of roleplayers. Somewhere out there is going to be a group that is interested in that same type of RP you are. It's just a matter of finding them.
And even then, it's not a guarantee you're going to be flooded with RP once you find them. Unless you're actively putting yourself out there and getting that RP, you're going to spend a lot of time sitting idle. That's not saying you need to be hopping from one great, earth-shattering event to the next or anything like that, of course. It's just that downtime is normal, and it will only last for as long as you sit on your laurels before hunting down the next story arc you want to tell with your character.
And even if there was a list of "perfect traits" to give someone to make them likeable and attract RP, that doesn't mean that you'll have fun playing that sort of character. That's why it's most important to play something you yourself feel comfortable playing and have fun with. Balmung has a lot of roleplayers. Somewhere out there is going to be a group that is interested in that same type of RP you are. It's just a matter of finding them.
And even then, it's not a guarantee you're going to be flooded with RP once you find them. Unless you're actively putting yourself out there and getting that RP, you're going to spend a lot of time sitting idle. That's not saying you need to be hopping from one great, earth-shattering event to the next or anything like that, of course. It's just that downtime is normal, and it will only last for as long as you sit on your laurels before hunting down the next story arc you want to tell with your character.