Janna is pretty bad at being aggressive because she has literally zero damage in both bases and scaling. That's why stuff like magic pen is really weak on her. Playing "aggressively" with Janna generally consists of shielding your AD, hoping they're competent and follow up on your CC.
I was impatient and I do test it. I made success. Literally psyched-out the enemies, as they showed no intention to lasthit minions. It is all to focus on one enemy. For example, if I am on bottom line versus nunu and master yi. All I do is to land as many as possible basic attacks over yi, until he went low health. When his potions end up, he will be forced to back. And he gives me time to fight out with nunu. This may happen in 5-6 waves of minions. Now I will need the help of my carry to dominate nunu and force him to go away from the minions. All this time my teammate land lasthits. When yi came back, I just give him a hit, when he land lasthit and I try to harass him. Obviously if I do this, they will attack me to. That is why I max up the shield. I took benefit from the damage absorption and the bonus attack damage. All this situation makes them unable to maintain proper micro and it seems that they stop being focused on minions, but how to avoid my harassment. When I do this I start with 5 potions of health and they take place every time. Judging by more than 10 games doing this, I fell really comfortable to harass with basic attacks, mainly because of the movement speed. Janna could be weak hitter, but her strength is in her third skill, the shield. I noticed that heroes like caitlyn, varus, and so on are trying to hit me instead of my carry, with their CCs, so I can benefit fully from the potions and the shield damage absorption. It is long-term offence.
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That being said, one can assuradly play her as an agressive support, the thing is, her autoattack is not exhilerating, and thus we should focus on poking rather than dishing out damage, because as far as that goes other support like
Now, poking withe her W from time to time will:
1.Not be a heavy lash on your mana economic, also since you will have items which can give you a decent amount of mana regeneration if you do decide to build ap.
2.Have some nice cc in form of a slow, a leveled W will slow the enemy in such a way that the ganker will first of all have an easier time ganking, and second of all champions like
3.Deal a good amount of poke damage.
MagiPen marks, Armor Seals, Flat Ap/Ap per lvl/Flat MagiRes/Magires per lvl Glyphs to taste and either Flat AP or Gp/10 Quints will give you what you need.