Note Math may not be too good, currently midnight and doing multiple things at once
~Passive- is too powerful to be a thing tbh. Imagine a full build heavy AP, Lets say 700 Ap in regular form, +5/10/15/20%, Thats an entire other rabadons (They can even stack onto each other [Since you didn't say they can't, so thats like +40% Ap or so which brings it to almost 1k I think, I'm making these numbers up in my head since I can't do the actual math atm.])
~Q- is too strong in my opinion, It has high base dmg + a good A.P. Ratio (If you have 700 Ap for example, and its ranked at 5 points, It's 200+350(Then +5/10/15/20% of ap boost if in magical girl form + a taunt) for the low cooldown of 12 seconds, Basically with 40% cdr it comes out to like, 8 or so seconds)
~W-(This one is heavily unfair) So first, the leap range at level one is pretty nice, 300, Non evolved Kha'Zix leap, but then 400, okay, 500, wow nice range, 600, what the, 700, That's pretty high. (keep note Shen dash is 600 range) Not just that, but they are stunned, + nearby minons and monsters feared for 1.5 seconds (free damage on enemies if you AA without taking minion aggro.) (If in girl mode) Then it does a massive base damage of 00/125/150/175/200 + a 1.0 AP(ABILITY POWER!) as PHYSICAL DAMAGE. So you can't itemize against this champ in lane because of this MASSIVE mixed damage (Keep in mind the extremely powerful passive) With 18 seconds cooldown, I think the cd goes down to about 10 or 11 seconds remember my note
~E- This just makes her a automatic 1v1 winner. So first, in normal mode, They are slowed for 1 second (making her Q W easy to land) Then they are feared (once again making the Q W easy to land) and then blinded (Good bye AA fighters) and if in magical girl, this turns into 6 seconds total of cc/negative buffs + what you can land with Q W, Making any melee AA fighter (jax, Aatrox, Fiora) completely useless (this if they don't buy QSS)
~R- Another Ap bonus, + her passive + Rabadons +masteries.
Reduces AP by 50%...Okay, grants 75%R AP as attack dam... Wait what? So is she the ultimate hybrid fighter? Build massive AP and turn it into AD? Lets see. If you have 700 AP for example, (Without your passive being included) It gets cut down to 50%, 350, then 75% of that is turned to ad (Somewhere around 250 AD) Then you get a MASSIVE attack speed steroid, .. You say enemies within 150 range of auto attacks are dealt 50%, Does that mean her Auto-Attacks are also AoE now like Rek'Sais Q?(Plus the fact her range is 175, so enemies might not even get near enough for the damage reduction if for example they are running away so they will take the full force of damage) The cost is a total noob bait though, 10% of Hp per second, Well how much Hp, current or max? If Max, it's not a trade off worth it cause your getting damaged and losing a pure 10% every second (some fights last more than 6+ seconds if not done correctly, especially if a team is hesitating) With the low price of, 60 seconds cooldown. Is this an instant deactivate spell or how long does it last?
I love your champion ideas with bows, changing genders etc.. But some of these seem quite unfair. High AP damages, + High AP Ratios that turn to AD on one move, then a ult that completely makes her a AA machine (IMagine the life steal on that) You can't quite tank this damage cause if the tank has thornmail, Don't turn on the passive and use the high AP abilities, If the tank has Banshees, mercs and spirit visage(Lets say mundo) wreck his health with the W massive AD, then switch to the ult and deal A massive amount of ad, But even then if Mundo has Thornmail he wiould easily live, but the burst/cc he would get destroyed if attacked from a bush cause of the massive stuns/fears/etc that he wont even get to activate ult by the time all the damage is dealt.
I don't know if i'm misinterpreting the moves but gameplay wise the champion doesn't seem to have fair damages/ratios. But it does seem like a fun champ to play. Though, Is it supposed to be a mage...a tank... a initiator....does it sit in the back lines and wait for the right moment to stun/cc... is it like Amumu? I need more info on these kind of things, or else the champ just seems like freelo, what kind of health/armor/mr does it start with, att.speed, we need to know more stats bruh.