Champion balance suggestions and possible bug fixes

I have a few ideas on some champion adjustments and potentially some bugs. Take these as you may.

Leona

1. I believe Pool Party Leona's umbrella visually extends beyond the actual reach of her Zenith Blade (E).
2. The particles for her passive, Sunlight, are hard to distinguish, even when I look for them. I believe they are especially often overlooked by her teammates, which is an unfortunate loss of utilization of her passive.
3. Suggestion: Perhaps Leona's basic auto attacks could mark her enemies with Sunlight as well.

Sejuani

1. Quick cast for Sejuani's Flail of the Northern Winds (W) is awkward. Could it be adjusted to not be based off her next auto attack, but rather be an attack of its own? Perhaps not even needing to be focused on an enemy. Just wherever the curser (or click) is?

Irelia

1. With Bladesurge (Q), is there room to expand the window of time (forward and back) that a minions death will still refresh the cooldown and mana? It feels "off" by just a little bit. 0.25 seconds before or after?
2. I'm sure this is a long stretch, but as a melee champion, Irelia's Transcendent Blades (R) can be hard to utilize. Especially in a close or sudden encounter. When an enemy is suddenly upon you, it seems hard to hit them with this skillshot. Perhaps the skillshot's width can be adjusted to a significantly wider path for the first 50 units or so. (i realize this argument could be made for all skillshot champions, just something to consider)

If anyone else has thoughts or ideas on these or other champions, comment below. Thanks!