Caitlyn with a "Charged Ult"?

Have it add lethality and minor amounts of damage as you charge then release her ult. Use the concept from stuff like Vi's Q etc. That way her ult isn't completely predictable. You can release it for less damage early on but you get that surprise shot in. Or hold it for something a little trickier. Call the tacked on ability modifier something like "Breathless Assault" and make her inhale as you hold it. I read somewhere that you were planning to give her ult some spice. I feel this would be pretty sweet and still thematic and befitting without making it op.

One of the biggest issues with her ult is it's practically useless on armored champs unless she has pen which no one typically builds. (I do XD and because of that I realized the potential of this small modification)

Most want her ult to crit or "cripple" (stun, slow, wound) But I feel that has the potential to break her.

Another option might be to make all basic attacks crit for however many seconds you held it. (up to a certain amount) Idk I got inspiration to write this and now I am out f gas haha. But mainly I feel her ult loses a lot of it's flair as she turns into an item reliant aa champ quite often.