After X indicators
Several characters, like Graves, Sona, Annie, Xayah, Pantheon, or Jhin, have a special effect that happens after you do something X times and have an indicator for this located under the mana bar, or have an "ammo" indicator showing when they will have an attack pause or change. This helps the player keep track of when this special effect will happen. Other characters don't have this, and so you have to try to count or look at the buff bar or try to see a usually very subtle graphical effect on the champ model to see when the effect procs. Some also have a falloff so just counting is not enough.
- Neeko gets an empowered AA after 2, no falloff. Very hard to see hair glow.
- Ashe can use her Q after 4 attacks, with falloff if she stops attacking. Hard to see glow on her bow.
- Kassadin can use his E if 6 abilities are used by anyone around him. Can't really count since anything around him procs and not all are visible. Very hard to see ring around his model
- Diana gets a cleave after 3 attacks, no falloff. Sword glow can be hard to see, especially if dashing around.
- Caitlin gets a guaranteed crit after 6 attacks, no falloff. Hard to see, very quick effect around her gun when it actives.
- Sylas builds up petrocite bursts, with falloff. It's hard to track the number except on the bar, and his glowy hands can be heard to see.
- Ahri's Q heals after X spell uses, no falloff. The only sign is a very slight green tint to her ball.
- Malzahar builds up voidling charges with spell casts. It would be nice to see the number in the next w cast under his bar.
- Ryze builds up runes. There is no visual indicator for rune count, just a counter in the buff bar. He needs to know how many for telling if he is gonna proc move speed bonus.
- Rumble could use a tracker for Harpoon ammo
- Xerath could use an ammo counter for his ult. Due to how it is exclusive use, this is less essential, but a nice touch for consistency.
And others.
Could these champions also get the indicator under the mana bar? This would unify the ui language for all characters with an "after x something happens" type ability and ensure that the cues for it are visible in team fights, as the health bar has overlay priority above any fancy effects happening. It would just make all champions that have these types of "counting" or "ammo" abilities much easier to use and also make it easier to switch or learn new champs since you already know what the visual que for this kind of thing looks like.
Putting a little depleting bar under the mana for timed abilities (singed ult, kog w, Leona w, Riven Ult, etc) would also be a nice UI touch.