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You can romance Aerie (as well as Jaheira and Viconia), and in Throne of Bhaal, she can even have a child if you play long enough (the Paladin will want to baptize the child, the Druid can be the midwife, etc.). I'm not sure what class is required (maybe any race will do, I don't know). Also, a bard-tiefling can romance her, and you'll meet him later. Just so you know.
Anomen wants to join the Order of Paladins, and his quest will help him do that (by the way, a female protagonist can romance him).
Regarding the similarities, I read comments about him. They say he's trying to convince himself of his goodness more than he's trying to convince others. Something like that. Unfortunately, I haven't played with him, so I can't say anything. But later, we'll have a Paladin, and I like him. He's like an old warrior. I think you'll like him too.
By the way, here's some more:
BG1
Have Minsk, Dynaheir, and Edwin in your party at the same time. Since Edwin wants Dynaheir dead, Minsk becomes unfriendly and withdrawn.
Viconia and Kivan have a very complicated relationship, and Viconia also has a very "warm" relationship with Xan.
Take Yeslick and Kagain in your party to see how different dwarves can be. Yeslick despises Kagain.
Safana and Coran. Coran will shamelessly flirt with Safana, and she, in turn, will reject him, which is quite amusing.
Quayle and Tiax. They don't have much love for each other. Quite funny.
Faldorn and Jaheira have a tense relationship because they belong to opposing druidic faiths.
Take Eldoth, Sky, and Garrick and watch the love triangle unfold. Go for it!
Xzar and Montaron vs. Jaheira and Khalid - if the former find out that the latter are Arfists.
BG2
Only conflicts are described here.
Valygar – Edwin
Minsk – Edwin
Keldorn – Viconia
Keldorn – Edwin
Keldorn – Anomen (if Anomen fails the test to join the Order)
Aerie – Coran (not fatal, but one of them will have to be kicked out of the party)
Aerie – Viconia (Viconia will make fun of Aerie until you kick Viconia out, or Aerie leaves the party herself)
Aerie – Jaheira (Jaheira snaps at the silly Aerie. With proper dialogue management by the player, they will reconcile; otherwise, Jaheira will force the player to choose: her or Aerie)
Aerie – Anomen (if Anomen fails the test to join the Order, not fatal. In the latter case, Aerie may get hit on the head with a mace and will slow down the whole game, which is extremely unpleasant.)
Protagonist – Haer'Dalis (Haer'Dalis will hit on Aerie. If the protagonist wants to maintain a romance with her, Haer'Dalis must be kicked out)