Lets look at the unique identity on the marksmen
UNIQUE keep this phrase in mind
Sustained dmg dealer according to Riot and she does it well(especially that disgusting lifesteal)
control markmen her long range is very helpful to this theme making sure a champion can't make a wrong step/accidentally walk on a trap
Dravens identity is DRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAVEN
the spellslinger adc both his auto and Q hit like a truck and nice affinity with cdr
the up close marksmen a shoort range burster.......yet.......no cigar
the hyper carry able to reposition and launch hiroshima nukes from afar
THE JUMP JUMP JUMP/mobile adc she constantly jumps and is this early-mid game slightly falls off late champion
hyper carry adc...wait...somethings wrong here
the wombo combo master+an early game bully synergizes well with any aoe cc
wait mordekaiser still has an identity???
Roaming marksmen/second jungler or actually jungle marksmen BIRDS THE WORD THE BIRD BIRD BIRD BIRDS THE WORD
the equal adc has equal power in both utility and damage
the your the kind of guy who wants to watch the world burn adc/apc
another hyper carry adc although riot intended for her not to be a hyper carry....wait.....something is wrong here...
the assassin-esque adc any ways SUPRISE BUTSEKS
more like URGOD
long range spellslinger adc you'll QQ more then playing in solo Q(get it he uses Q a lot)
the hard carry the tilter the flamer the toxin one the tryhard the tank melter adc
now we have identity issues with 4 champion mord,teemo and urgod where just jokes

UNIQUE well we have 3 hyper carries and kogmaw also fit the description of a sustained dmg dealer
both jinx and trist to have basically near similar purpose
but basically what I'm trying to say is
has no difference he isn't unique at all apart from his 5.00 AS which isn't even that interesting of a mechanic
my opinion atleast