Beauty for me is personified by the character's personality as well as their appearance (I'm not talking about the word beauty as it's physical aesthetic sense). I can't really seperate personality from someone I find beautiful, because they are usually beautiful as a whole because of their personality (or an aspect I love about it), but I know there are a lot of characters who are popularly considered to be physically beautiful that I don't find beautiful at all because I dislike their personalities (Anora, for example).
DAO: Bann Teagan, Duncan, Cullen, Nathaniel (Awakening), Dagna (everything about her is beautiful
), Loghain (I know, I know, but I understood his perspective and booted Alistair so quick to take him in; that and he has a really hot voice and DILF thing going on).
DA2: Varric, Arashok and pretty much all Tal'Vashoth (rawr), Isabela, Bethany, Cullen, Cassandra.
Actually, I didn't enjoy DA2 very much at all (besides one semi-hot moment in Ander's relationship I really didn't find the romances appealing whatsoever), but Varric, the Qunari present in it, and Isabela were the best parts by far, IMHO.
DAI: Blackwall, Cullen, Vivian.
I love Cullen and all, but I actually find him more attracive in DAO (with his nervous infatuation with my 'Amell' mage) then what I've seen of DAI so far. I hope DAI does him justice.