ArwensDaughter
Adventurer
There’s a new UA with additional subclasses, including one who specializes in scrolls.
Both a draconic sorcerer and divine soul would provide some interesting roleplay with Surina (Dragonborn LG Devotional Paladin). She's likely to feel both a kinship with a draconic sorcerer and some conflict over a human with draconic connections. With divine soul, she'd be drawn to the divine connection: maybe even a bid envious of it, depending? Connection to the divine is very important to Surina, but she still tends to think in either/or absolutist categories. She can be a bit judgmental about those situations and persons that don't fit her neat little categories. Everett, for example, really annoyed her early on, as she is suspicious of noble types anyway, and he didn't seem to take anything very seriously.
In all honesty, I'm kind of hit or miss with RP; it's my weakest aspect as a player. But I've been trying to stretch myself with Surina when I have the mental energy to do so.
Then there's the fact that the PCs that Surina has had the easiest time interacting with (Keth and Zadolix) have both faded out. So maybe RP options with Surina are a bit dangerous?
In terms of balance, while Surina has healing capabilities, I've discovered that she's angrier than I realized at first, and is more likely to use her spell slots for smiting. So you aren't stepping on her toes/her role if you opt for a healer build with divine soul.