Here are some suggestions for tool tips Riot

Since you don't seem to have someone making sure all the tool tips are similar in style and consistent.

-Pick a new color text for things that scale with level and stick with it.

You seem to just choose whether or not you want something to get white text if it scales with level. Just randomly decide. Choose a new color and stick with it for anything that scales with level. White text is for true damage.

-Stick with a consistent style.

Just look at the difference between Aatrox and Ahri tool tips. Aatrox has some nice character to them with descriptive words and Ahri's is "Deals damage in a line".

-Make sure all the relevant information is there.

Examples

Aatrox W has the health cost lumped together. A new player has no way to know that it increases by AD and not HP.

Amumu E also lowers damage from physical abilities and not just auto attacks.

Poppy's E and R level up portions of the tool tips don't include the spell getting reduced CD. It also doesn't include the ult gets increased duration.

-Work on wording.

Which looks better?

Currently

Blitzcrank's Mana Barrier can activate once every 90 seconds when he falls below 20% health. This creates a Mana Shield equal to 50% of his current mana that lasts up to 10 seconds.

or

When Blitzcrank drops below 20% health he gains a shield equal to 50% of his current mana that lasts 10 seconds. 90 second CD.

Pls Riot.