Honestly I despise this new champion already for a multitude of reasons.
I just feel the need to rant right now, if you don't want to read some random's negative opinion then please click away.
Firstly, I hate everything about her design. She's supposed to be from the Void, but she's literally a human in a suit. It unironically makes me mad, because I don't think there's a reason why a character involved with the Void should look like a generic human. That's probably what I hate about it the most, just how generic and uninspired it is.
Secondly, I can already tell just by looking at her that she'll be the next Lux/Ahri/Jhin in terms of skins. She's going to be mega popular if she's viable, and Riot is gonna want to leech as much cash off of her as possible. Hell I think that even if she's like Jhin where she's trash to play she'll still get tons of skins.
Lastly it seems that Riot kept their truth when they said she's "high risk/high reward like Vayne" and just like Vayne there's hardly any risk involved besides the Ultimate.
Overall I just hate this champion, I'll probably forget she exists in a month or so.