Ethical slut ingenue character

Hey :) So- I'm kind of playing with concepts in my mind (and procastinating on TV tropes... don't we all?) so I'm trying to think through the characters in a novel I will someday write...

So, case in point: I'm thinking of writing a character who is, at the same time, an ethical slut and an ingenue. Sounds a bit contradictory?

What I have in mind is something along the lines of:

Ethical slut in the sense of being very comfortable with her own body and her own sexuality; never ashamed of expressing desire/sexual agency, strongly believes consensual/mutually enjoyable sex can never be morally wrong. She has a few kinks of her own and is quite happy to explore and indulge her lover's. She is very playful and flirty. Sexuality is one of the ways she seeks love, beauty, self-expression. Very Anais Nin.Morality-wise, very much "for happiness!"

Ingenue in the "I could never imagine anyone wanting to hurt me or other people, ever" sense. Never thinking ill of anyone, assuming everyone has good intentions, a believer in The Power of Love; oblivious to judgement and double standards.

Relationship status: She is mostly monogamous; and in the first chapter she is starting a committed relationship. (Although she does believe, theoretically at least, that it is entirely possible to be in love with more than one person at the same time). Her relationship with her ex is still very emotionally warm and involved, although purely platonic. (There's a big "I want my beloved to be happy" in their background). She is the only one to whom the ex ever came out as a crossdresser; and in many ways the one who got him to stop feeling guilty about it and to accept/explore this part of his personality.

Sources of conflict: The ex is now engaged to a stern Holier Than Thou type (a Stepford Smiler deep within), who values appearances and "being normal"; she does not even know that he crossdresses; Ingenue Ethical Slut is worried about him because she genuinely wants him to be happy/not sexually or personally repressed. At the same time, fiance hates Ingenue Ethical Slut's guts kind of on principle, because she's just not really comfortable with the idea of one being friends with one's exes. Ingenue Ethical Slut's new boyfriend has been a bit of a loner in his past; there is a teeeny tiny bit of "I can't believe a girl like you would notice me" in their relationship (mostly understated/not unhealthy or wangsty, but still present); so when she is being her flirty self/gets emotionally close to everyone else/ it looks like other characters may fall in love with her and she doesn't even realise- he feels insecure. He is also more level-headed than her/less of a Wide-Eyed Idealist, and tries to be very protectiv of her feelings.

That's as far as I've developed it. What do you think: good potential or a bit Mary Sue-ish?

That sounds like Nana "Hachi" Komatsu from Nana. Falls in love easily, has sex with him and when that doesn't work out she repeats.

Difficult to gauge the level of Mary Sue without the actual execution of your hypothetical novel! Frankly, as long as she comes up against whatever consequences follow her lifestyle of choice and is forced to deal with them in a realistic way that actually requires exertion, time and (gasp) character development, you should do fine.

Thanks for the replies :) Never been into manga so far, but the Nana storyline looks interesting, so I'll probably check it. The character has been very much inspired, in my head, by a U2 song: https://www.youtube.com/watch?v=RVFgxkL_vuk

What I'm trying to play with is someone at the same time strong and vulnerable; it is kind of my belief that people who are very reserved/neurotic/cautious with others think they will be crushed if they get hurt; but very strong people allow themselves to be naive from time to time, to be vulnerable, to be more open than it's wise- because they think that if it'll turn out right they'll form meaningful connections with others they'd never get a chance at otherwise and if it'll turn out wrong they're strong enough to bounce back.

Glad to be of service, mate.