PSA: About all this "Support Singed" case
This thing exploded like a nuclear bomb on the boards and ppl are taking extremist positions about that player pick and behavior making their arguments, valid or not. So, since we are here I wanted to put down some guidelines about what is and what is not supportive behavior without any prejudice.
First of all... Should I behave supportive? Hell yeah! Like it or not you are in that position, intentionally playing like you are any other laner with the focus on farming and kills is not what you are supposed to do. This doesn't mean that you should never do it, it's just not your primary focus and falls really down in terms of priority.
But what decides which is a "Supportive behavior"? Common sense. You are not supposed to be a healer nor to soak any incoming damage from the enemies. But since you have one less thing to care about (farming) you have to put more effort into controlling the field, which means wards, signals for ganks/MiA and securing kills when the chance comes.
Does it mean I'm stucked in botlane babysitting the ADC? Not at all. Given the conditions you are free to roam and farm some gold yourself, note though that leaving alone a rather vulnerable player in a lane where usually you'll find 2 players contesting him brings a lot of risks in doing so and when you decide to leave both you and your ADC must do your best to make it possible bringing in vision and be ready to retreat.
But I picked a mage/bruiser/damage oriented character and I want to play it! Fair enough, what is that thing that your char is supposed to do? All-in? Poke? CC-Nuke combo? Then a good coordination with your lane partner can bring some huge snowball potential which also can give you more freedom about roaming and farming.
To put it simple, it doesn't really matter who you play, we've seen double ADC Marksmen lanes in worlds! But this things are going to work if both the laners (and the team too) work around making it possible. It's not picking X that makes you a good/bad support, it's how you use it to advantage your team.
or something he might manage just fine in that 2v1 and if the ADC can manage just fine in the 2v1 why not use that free person to add pressure somewhere else
can farm quite well even 2v1 since they have such long range
And it is even better if they are against
since she auto pushes which means the ADC can farm under tower (though they would have to be careful about
or other champions who could towerdive)