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Rhajat
Diviner (HS: Oni Savage (Hayato), Troubadour (Felicia))
A+ Support Partners: Caeldori (Sky Knight), Mitama (Shrine Maiden), Selkie (?)
Personal Skill: Vendetta (When user triggers a battle against an enemy they've already fought in this map, +4 damage dealt)
Growths (With Default Class) [Base]:
HP: 40% (40) [40]
STR: 12.5% (17.5) [15]
MAG: 47.5% (62.5) [60]
SKL: 20% (30) [10]
SPD: 45% (60) [50]
LCK: 42.5% (47.5) [30]
DEF: 20% (20) [25]
RES: 35% (45) [35]
Okay first of all Felicia only has a 35% base magic growth?? I really thought it was higher than that... Even with the 15% boost from the Diviner class Rhajat's only just about able to surpass her default magic growth... At least her HP is exactly the same.
In terms of raw stats Rhajat is possibly the best mage in Birthright. She's guaranteed to start with at least 14 (+2) magic and 13 speed in her base class of Diviner at level 10 no matter who her parents are, and her natural 60% magic growth and 50% speed growth are both hard to ruin with all but the worst mother. Ophelia is often considered to be one of if not the best child in Conquest and even she's only got a natural 45% growth in both speed and magic. Unfortunately unlike Ophelia Rhajat doesn't have a paralogue filled with rare and powerful tomes, or access to Nosferatu... She's also reliant on S supporting Hayato with someone to exist, a unit much less useful than Odin is without a huge amount of investment. Otherwise I don't think it's too unfair a comparison to say that Rhajat is the Ophelia of Birthright?
Unlike Ophelia however, Rhajat's stats that aren't magic or speed or resistance are all mediocre to terrible. Much like the original Tharja her luck and skill are both quite bad. Rhajat in fact has the lowest (non-Gunter) skill growth out of any unit in the entire game, although her mother is at least guaranteed to boost it slightly beyond its base value. Her 15% strength growth has her draw with various other magically inclined kids for lowest out of all second generation units, so she's unlikely to be much of a mixed attacker. 40% HP and 25% defense aren't terrible, but the most powerful magical mothers Rhajat can have are likely to make those defenses worse. Otherwise Rhajat is fairly resistant to bad parents - even a mother with a 0% base magic growth like Setsuna is going to leave her with 30% magic growth (45 as a Diviner), and that's still okay by Birthright standards. Just don't waste someone like Kagero on her!
Onmyoji is an obvious promotion choice for Rhajat. Basara can work and will make her a bit bulkier, but even Kagero!Rhajat is going to be stuck using Brass Naginatas for a while so don't count on her being competent as a physical attacker. A unit with skill as poor as Rhajat won't be activating Rend Heaven very often either. A Rhajat with either Sakura or Oboro as a mother could however inherit cross-class skills through her promotion choice, so keep that in mind. Oni Chieftain will hugely increase her bulk while still allowing her to use scrolls, but be wary of her skill and luck - it'll only make them worse. Blacksmith isn't really worth considering unless you really want her to grab Lancebreaker, and even then it's a level 15 skill. Felicia!Rhajat could also go Strategist - her magic will be on par with Onmyoji and the extra movement will help a lot, although it'll make her defenses even worse and she might struggle to survive against foes even with the Horse Spirit. I'm sure Flame Shuriken Maid Rhajat would also work if you had 2 Arms Scrolls to spare and you really want to put Tharja in a maid outfit.
I had a lot to say about Vendetta until I checked how it works on the wiki, and it turns out it's just a much more situational Quick Draw. It only activates on player phase so I can't combine it with Strong Riposte like I thought I could... +4 damage when attacking is still very nice, but being limited only to foes Rhajat has fought in the same chapter means it's most likely only going to be effective against foes who have already been weakened.
I don't think the Sky Knight class has much to offer Rhajat besides Darting Blow and Rally Speed - so many other units could do a Bolt Naginata Falcon Knight build with much less effort, although Rhajat's high magic would make it work. Shrine Maiden has nothing for her but Rally Luck, and by the time you've reached an A+ support Rhajat would be able to go Onmoyji anyway. I genuinely have no idea what classes an A+ support with Selkie would give her access to - presumably either Apothecary or whatever class Selkie's mother has? She can't inherit Kitsune and she already has Diviner by default...