Unique Things About Champions Other Than Mobility
I'll start:
Channeled abilities
I'll start:
Channeled abilities
Lack of mobility. I include this because in this day and age, a lack of mobility is more defining than a surplus.
Pets/traps. Kinda lumping these together, but there is a limited pool of these, and an every one of these is unique.
Terrain creation. Again, limited amount, and they tend to be pretty unique.
Non-movement imparing CC/controlled movement CC - pretty defining, as fears, silences, polymorph, and blinds are all pretty rare.
I'd love to see more directional CC, or some sort of mechanic that makes it so a champion can't change the direction they're walking. Slippery area that causes you to slide all the way across it to the other side based on the direction you were going when you first touched it.
As fun as that sounds, I can only imagine how infuriating it would be when you step on a slippery spot and end up walking straight into the enemy team.
At least charms make you walk slower while taunts so far only work in medium-close range
My problem is that we can only imagine it right now, because it doesn't exist yet :(
Suppresses are pretty unique at this point, granted it's a channel, but I believe under 5 champions still have it.
Immunity mechanics (Kayle ult, Poppy ult, etc.)
With the way Rito is cracking down on them, silences are becoming more rare.
Blinds are pretty uncommon, probably because they're so ineffective. I mean, look at Lee. Blind and OP for how long now?
Detonating skill shots (such as Vel'koz, Karma, Lucian)
Irregular path skill shots (Viktor, Diana, Rumble)
Returning skill shots (Gnar, Sivir, Ahri)
I know what the thread says, but long-range mobility is pretty unique (Nocturne, Shen, Twisted Fate, Pantheon, Rek'sai)
Vision control (Nocturne, Graves)
Vision control's always something that has struck a chord for me. I would love to be able to see more champions with vision impairing abilities.
Skillshot blockers (Yasuo, Braum)
Revive effects (Sion, Anivia, Zac, Aatrox, Zilean)
CD reducers (Shen, Xin, Zilean, Skarner, Taric... this might not be too unique, there could be others I forgot)
CD resets (Irelia, Katarina, Yi, maybe others)
Ammo abilities (Corki, Teemo, Azir, Akali)
Stacking mechanics (Nasus, Veigar and Sion) Mana regen auras (used to be unique, now don't exist -- old Soraka, Mana Manipulator) Abilities gated by HP rather than mana or energy (Vlad, Aatrox, Mundo) Resource bars which require managing and trigger when full (Gnar, Rumble, Shyvana) Tethered abilities which "detonate" to provide CC (Karma, Nocturne, Leblanc) Zone-control abilities which prevent entry or control lane (Ziggs, Morgana, Orianna, Lux, Azir) Minions who replace your autoattack (Azir)
I'm sure there are more. Azir honestly is one of the more unique designs recently, IMO. Even aside from his mobility.
Stance based kit (
, formerly
)
No cc or mobility (
)
CC resistance/immunity (
)
Team wide shields (
)
Taunts (
) I would like to see more of these, they are pretty interesting.
RIP stance-based Sona. On that note, auras are pretty rare now: (
have persistent auras,
and
have temporary, activated auras). All of the global auras have been removed, and the only uninterrupted auras I know of are on Zilean, Heimerdinger, Janna, and Nidalee (hidden passive).
Makin' money (
,
)
This guy is just too fly for me to remember him (
)
Uh, forgetting someone? 
[{quoted}](name=The Red Warden,realm=NA,application-id=3ErqAdtq,discussion-id=dNN1KiYx,comment-id=000c,timestamp=2015-02-10T02:40:03.472+0000)
Makin' money (
,
)
everyone forgets about his passive ._.
EDIT: Someone already posted this. I feel silly now :p
Personally, one of my favorite things is spells being powered by other people using spells. Maokai's passive and Kass's E. Pretty sure those are the only ones.
Point-click cc and aura abilities
Specialized ability combos (next ability's effect changes based on previous spell cast)
more and more, Lack of mobility is a unique thing (but mostly because there is some sort of compensation for it in having a stronger kit aside from that)
DoT effects
Non-linear skillshots.
Lulu literally lulu
There are also certain unique forms of mobility, aka blinks, stuff like Kata, Shaco and Ezreal with a much more powerfull alternative to dashs in terms of the amount of safety granted in terms of speed to move
Untargetability
Actual skill "combos" where you need to activate debuffs to have maximum effect discounting aa oriented comboes and mere % damage increasers. I believe only brand, aniv, zed, sej, cass, diana and lb have these. Akali and xerath used to too.
Brand is probably the closest we'll ever come to a true "Combo Caster". However, something else similar to him wouldn't go amiss.
Akali used to? Do you mean Katarina, or was there formerly something different about Akali?
Brand is probably the closest we'll ever come to a true "Combo Caster". However, something else similar to him wouldn't go amiss.
Akali used to? Do you mean Katarina, or was there formerly something different about Akali?
Vel'koz is totally a combo caster.
forgot katarina akali very recently used to be able to proc her q with e, although you might not count that.
Global ultimates (
)
Terrain creation (

)
Wall pinning (
)
CC removal/ignore (
)
Global ultimates (
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) Terrain creation (
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) Wall pinning (
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) CC removal/ignore (
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Your forgetting 


and
from your global ults. To some degree also 
and
(these three are more like pseudo-global ults).
Notice that most of the global ults are offensive however, while
has a defensive global,
has a TP, and
's ult is both defensive and a TP.
Mind control....
Crowd control effects that impact both the caster and the target (
) are rare and offer significant counter play and risk if they are channeled. Abilities that crowd control allies (
and, to a lesser extent,
) are uncommon and sometimes aggravating, but they certainly make game play more interesting.
True damage

Magic Damage AA resets

Stuns that don't say they're stuns, because fuck you that's why ( ...
ult )
Skillshot ally buffs 
Dodge/Parry/Block

True Perma-Stealth
Infinite Stats
Entangled
Clones
Potential Infinite Stun?
Scaling AA Range per Level
How about something similar to
's ball?
Dont think theres anything really like that.