I'm just going to tell it to you straight, so you can develop from there.
The following is meant to help; not to be harsh. Plz don't hate me >.<"
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Passive, Any disability that is set on this champion, is also applied to all near by enemy champions
This legit means the one intuitive thing in league (cc is how you shut people down) is constantly ignored on this champion. You need a VERY good reason to do this. You also need to make whatever substitute counterplay you put in VERY OBVIOUS because they won't know what's happening here. Pretend you're facing your champ for the first time.
Q Shoots a Prism Beam , if it hits a champion X damage .... if I hits a Mirror it Bounces off Mirror to 1 additional target
Is it 1 target regardless? What is the actual bonus for hitting the mirror? Why would I hit a mirror and increase travel time when I can just hit the champ?
These are the questions you need to ask.
W Shoots a White Beam of light, hitting all mirrors Heals and shields all Near by allied champions and blinds enemy champions 1 sec
So, hitting all mirrors gives X. Why ever have more than one mirror out since it'll increase the time until I get my shield. Does it give the shield more range? Is the shield hitbox radius on your champ? What about the blinding radius. Is that centered on your champ or in a radius where the skillshot ends? Where should a savvy opponent be to avoid said blind?
E Place a Mirror on the ground You can have up to 3 on the ground at once, When ever one of your attacks hit a mirror it multiplies and hits the 2 closest targets, ( priorities 1 mirror , 2 enemy champion , 3 minion )
Do said mirrors have a threat radius like Azir soldiers? It sounds like it auto-aims your abilities.
R Target champion is Blinded by a Prism Beam ( Deals no damage ) clicking to go forward, they run backwards, clicking to move backwards they move forwards, LEft goes right , right goes Left . 5 seconds
There is no way this would end up in the game. Forced positioning/displacement cc is the strongest type in the game second to death. Since it's a simple pattern the champ would be either godlike or literally have no ultimate depending on the opponents. For how weak the rest of her hit would have to be I don't think it would be worth. You're asking players to forget 1000s of hours of muscle memory in a split second for something that will last 5 and then revert. A 5 second fear (as stupid as that sounds) would be more likely to end up in the game.
https://www.youtube.com/watch?v=WpWI1zuOrqY
? The above overlaps with her way too much.