In my RPs with Oppaiko, we only had a handful of encounters with angels, so my notes on this aren't going to be as detailed as anything I could provide for succubi, obviously.
In sports terms, where the demons are God's merciless and high-scoring offense, the angels are the staunch and vigilant defense. They are the diplomats and ambassadors, hoping that they will avoid shedding blood, but perfectly willing to when the options are few. Compared to most demons, they are calm, collected, and not quick to rash action. Most, however are stoic and rather humorless. They are uniformly appalled by the demonic lust, violence, and practice of slavery, but realize too that the demons are God's children and part of his plan. (Demons, of course, find them to be infuriatingly dull.) They do have sex, but it is decidedly vanilla and usually monogamous.
The Fallen, of course, are angels who have turned against God and, like the devils, seek to claim as much power as they can. In general, their tendency towards defense has been twisted into near-paranoia and they have the bad habit of over-thinking their strategies. That said, they do not hold back their punches like their more merciful counterparts often do, and their ability to convince or coerce with words rather than weapons remains undiminished. Their alliance with the devils is not as solid as the Demon-Angel one, and it is generally assumed that if they do manage to take the Throne, they'll quickly turn on and annihilate the other. It is, in fact, rare to see a joint devil-fallen force except in the most epic of battles.
All that said, of course, everything falls into a spectrum. I (as Atalya) am a pretty laid-back and non-violent demon and have the more defensive mindset of an angel, but I remain intensely sexual and enjoy the master/slave dynamic. So there are undoubtedly more sexual angels, or more violent angels out there.