i think i have a strong GP adc, nasus support idea. we can test it out, see how it works, a normals first if you wanna feel it out before ranked
the nasus support goes E-max, thunderlords/blue support item /fulltank and mostly his power is he helps waveclear for GP, and also nasus helps poke. ill explain how it works. i actually think nasus support is overall strong. youll see what i mean ingame.
GP starts relic shield + refill potion (i think its a strong start) because it lets us recall to sustain to lvl7. our waveclear plans start around level 7. we dont upgrade relic, i just feel its strong since it creates like 700g before you sell it, thats like 2 free kills
early levels, 1 to 6, i poke enemies with nasus E, and i want you to spam your Q on enemy champs. you get the mastery that gives 10 gold every time you Q a enemy so its pretty nice. you get gold from Q'ing enemies, plus CS
use your autos to CS, and use your Q on enemy champs on-cooldown to harass/get gold. combined with nasus E poke its very strong
next. you want to back after the first cannon wave (which is 3rd wave. possibly back after 4th wave), because you go OOM around that time. you buy the 350 mana item when you back, plus you get to refill your potion
your next back gets you a sheen
when you return to lane, keep spamming Q on enemies to harass and get gold, and use your autos to CS. our waveclear plan starts at lvl7
once you go OOM, probably lvl 5, back for your sheen and also get a 125g mana regen item (fairy charm). its useful (and you sell it later). think of it like a mana potion alternative. riot removed mana potions but those are a good alternative. you sell it for 90gold eventually, so the thing really only costed you 35gold and it gave you tons of mana. its worth.
once we hit lvl7, you have your sheen, we start doing a "waveclear tactic". heres how it works
my E will almost kill the wave bringing it to where 1 barrel clears it. so what you do is once the minion waves touch and the melee minions group together, you throw a barrel on our caster minions (and enemies wont hit that barrel) and then you throw a second barrel into their wave and Q the first barrel
when i see you throw a barrel behind the wave, that lets me know your "doing it". once i see that, i will E the wave, then you drop your 2nd barrel into the wave and Q your first barrel, which should blow the whole wave and give you extra gold on everything
only do this tactic when you have 2 barrels ready. which means you do it "every other wave" most likely since it takes a while to recharge
your skill order is QWQWQEQWQRRWWEEREE
the reason for this order is i found early ulti levels arent useful (but its good lategame). and skilling W adds decent lane power (lower cd. stronger heal)
also. save basically all your barrels for the waveclear plan. i will have a sightstone to let us escape ganks. dont use barrels for "plays and outplays" until after like 18 minutes. were mostly farming before 18 mins
now for GP battle tactics
in teamfights with GP, i want you to remember to NEVER use your Q on barrels. that is the "secret" to being good at GP. the mistake bad GP's make is they Q their barrels
instead of using Q on barrels, you want to just autoattack your barrels and save your Q to directly blast your enemies
even if you auto your barrels, they still do good damage (theres bonus dmg on them, and penetration). so using this "tactic" with GP, essentially it gives you access to both powers. it gives you barrel power, while also giving you Q power and letting you spam nonstop Q's on the enemy frontline
most GP's use their Q on their barrel, which is bad, because if the barrel misses that means you wont have your Q to blast enemy champs directly
next. with GP adc, i want you to mostly just stand back spamming 3 second cooldown Q's on the enemy frontline. while throwing in barrels "for fun". and i havnt even mentioned your ult (just use it whenever the 5v5 starts. it helps win the 5v5)
lategame with GP, your Q does very good damage, and it has like a 4 second cooldown. so just treat your Q like your "ranged auto attacks" and spam your Q on the enemy frontline while running away, healing, and auto attacking barrels
in the build i give, you have last whisper which is 45% armor penetration (plus 7% from mastery), 50% armor penetration which means you can feel good spamming your Q on enemy tanks. it will do decent damage with last whisper.
final GP build is: ER, IE, shivv, mortal reminder, 2tank items (options are deadmans, visage, warmogs, zzrot, etc)
early path should be imo: relic shield, refill potion, 350 mana item, sheen, fairy charm, bf sword, tabi, shivv, IE, last whisper, crit cloak, upgrade mortal reminder, essence reaver, sell boots at 2300 for tank item, sell sheen at 2400 for tank item
the reason it has no triforce is because i feel sheen is good on GP, but i think nerfed triforce is overrated, so you view your sheen as like your "dorans". and you sell your sheen lategame to complete your build. sheen costs 1000, sells for 700, so it costed you 300 overall, its like a "Big dorans". view it that way
as for boots. probably get tabi, sell it lategame for deadmans or something. if enemy has mix of AP and AD, probably go deadmans/visage for tank items
runes are AD reds/quints, scaling HP yellow, scaling MR blue
masterys are: 2% dmg, 3% dmg, natural talent, bounty, armor penn, warlords, 5 dmg, 2% dmg, 5% dmg, bandit
i think warlords is good. gives armor penetration, and useful sustain. and that bandit is op
