Ya...I'm gonna have to agree with Jiggly on this one...Offense intended cuz that's not exactly a good character design.
Let's see. Excuse sexism as you see fit, though usually it's due to the usual roles of women (whether in older society or in anime in general).
Her name is Luana, which means "Warrior maiden", of which fits her quite well. If you try to mess with her, she'll take you OUT. (Hell hath no fury like a woman scorned...)
Her powers are of plants, so she specializes in healing, also effectily uses her great strength. (she's also pretty agile.)
Ok, so right off the bat, I'm seeing "specializes in Front-Line AND Support." This in itself is a big mistake. You're basically saying this girl can do anything she wants because she has max stats in everything. Perfection is almost never desired in a good character. At first, when I was seeing "Warrior Maiden", I was thinking something closer to a Shield Maiden, but....ya.....
Anyways, this is telling me that this is a fantasy world, which I'll get to in a bit.
She's 5'08" tall, won't say what her weight is (actually, I was too lazy to determine her wieght...) but she's of a light frame (yeah, she's a LOT stronger than she looks...) & 21 years old, has black skin...actually, brown, it just what people call black... just making sure we're all on the same page...
With all these weird characters around, (a rubbery pirate, girls with cat ears, etc...) I just thought you guy may think her skin is TRULY black...
Anyways, she also has very deep blue eyes.
With a plant-based character, you'd think eyes would be green, but whatev ^^;;
So basically here, you're specifying her ethnicity, and saying that she's really good looking and is old enough to drink (according to modern rules)? From the drinking thing, I'm guessing that she's generally seen as a member of the male society at this point (by males).
She's polite, never tries to act like a guy, dresses modestly (opposite of Ivy from Soul Calibur...) & will not hestiate to stand up for herself & others, should they not be brave enough to do so themselves.
Her likes:
Gardening, Heavy work, (moving stuff around, etc. for this reason, her gardens always have big stones to decorate it.) Bathing, (in water, mud & hot springs) Fruits.
Her dislikes:
preverts, male chavinists, bullies, (all of which she will BRUTALLY punish...) girly girls, (not only are they annoying,of which she's too polite to outright say, they also give women a bad rep.) tomboys, (a lady should NEVER behave like a man.) junkfood.
I think you're mistaking the term "girly girl" for say, "valley girl"?
Aaanyways, Gardening is a check. Heavy work........not so much. Unless it's specifically for decorating and helping people, on that point. Besides that, heavy work is traditionally a male's job in the medieval society, saying that she enjoys it makes it seem that she's closer to a tomboy than was intended. Besides that, she's also a Warrior class over a Support with her healing magic, which just screams tomboy. I ASSUME she wears one-pieces or something close to that nature. Also is an ally of justice, which is all fine and dandy in in it's own right as far as tomboyism goes.
Besides this, you haven't talked anything about her personality. You've only mentioned physical traits and likes/dislikes, which isn't near acceptable for a character concept. There's no backstory (why is she this way?), no personality traits outside "justice!", nothing about her role on the battlefield, etc. I'm just seeing a bunch of contradictions between what's there and that tomboy dislike.
Ya, I'm seeing a typical Mary Sue self-idealized-insert here.