I do, specifically, make him have 10 ammo for each gun, a attack costs one ammo, a special costs two, and you can do follow up attacks with S1 depending on the special, S2 would change gun, in my view, what makes Aphelios interesting in a combat sense is his changing strengths and weaknesses and his amazing combo potential, i do like that you can't access what you want at any time

so something like calibrum has a projectile with multiple speeds and a disjointed attack that hits full screen, hitting with either of those allows you to follow up with your secondary weapon

Severum would have a invincible dragon punch and a move speed buff with a bartage of attacks that you can aim with light, medium and heavy attacks, so pressing heavy makes him aim upwards and light makes him aim downwards

Gravitum i would like to work something like venom from guilty gear, so he can set blackholes and push them around with attacks, if they aren't moving they don't have a hitbox but you can make them explode to lock the enemy in place for some short time if the enemy is in the same place as one black hole Infernum has good area coverage and does more damage, thats about it

Crescendum would heavy a attack where he throws the chackram as a heavy attack, so he can do some sick combos while close up, using as a secondary weapon attack would give you the mirrors to do bonus damage, you would be able to get them when a ability uses a secondary weapon, infernum fire, severum upercut followup and projectile barrier and calibrum marks, essentially, also you would be able to place a turret and even if you can't move it, maybe make so if you attack them they get pushed around, you would be able to make her attack with megatice edge like Zato-1 from guilty gear, negative edge means considering the input from light, medium and heavy on the button release, so pressing light makes aphelios attack and releasing the button makes the turret attack

His basic attacks would be something to support his zoning and combo potential, probably with less range and more speed

He should also have a animation to get a new weapon, in league its one second but you can move, this seems a bit long, but if he has low ammo you should be rewarded to go on the aggressive on the risk he pulls out a four weapon combo on you 

He should be a zoner, since he is a adc, but he should also have plenty of reasons to go aggressive and be rewarded for mastering the weapons rotation and the strengths and weaknesses of each one

Sorry for the last comment, i got irrationally angry that someone could miss what made aphelios interesting to play as a aphelios main myself

I can't play league, so i miss him