you forgot that you can Q 3times before it goes on cooldown

Karma.

Karma has an easy time with all ap assassins.

What about Galio?
I know he isn't exactly the most favored champion in Dominion, but against an AP and magic damage dependent champion he should fair well, right?

Yeah, not gonna play Darius. I'm an ass, but I'm not that much of an ass.

I do play Teemo, but every time I've Teemo'd vs Diana she focuses me hard and I get dumped on. How would I need to build to turn that matchup around?

I see people saying teemo can beat Diana, but I don't see it. I've played that botlane matchup before as Diana, and it was simply a matter of landing a Q. His movespeed makes it harder to hit Teemo with her Q than other champs, but once you do he just explodes. My 'solution' to the blind was to just build more AP and MR instead of buying a Nashor's. Her passive is nice, but you have the option of ignoring attack speed when appropriate.

Edit: maybe if teemo gets a Rylai? Strategy would be to dodge Di's Q, then run up and blind and get a few auto attacks in. Diana is pretty slow and teemo is really fast, so this might work. The only issue is that if you're winning, she'll just hang back and farm with Q. Maybe if you're REALLY good at dodging it, you can zone her? Regardless, I don't really like suggesting a strategy that revolves around dodging a fairly easy to land skillshot.

I've played Garen vs a Diana on TT (before remake), and got destroyed from the start lol. The shield blocks almost all the damage you even do from spinning. My guess its to play strong duelists with sustain/cc or someone who can stalemate and clear waves from a distance. Probably Xin or Jax can kill her while Karma, Galio, Gragas could stalemate.

The importance of dodging her Q is to know which way it bends

Sometimes its even better to use gapcloser to close in and dodge her Q,

because its curved, you can run straight into her face and dodge it, the weakness on her Q is cooldown, and Diana players tend not to R unless they hit a Q on you.

Or play a high range free farm champ like Syndra (that range on Q) or Teemo (lay a shroom, afk)
Or any champ with snare / silent, if she dash at you, snare her and walk away (prevents she R twice), or silent her and hit her.

I find it amusing that people still give that line. Focusing someone is not a counter. CC is not a counter. Yet as a combo they have been the "don't nerf" party's response to every complain of overpoweredness since at least when I started playing back at Orianna patch.

If I designed a tank that did so much damage it was worth it to focus him instead of a carry, I still wouldn't say that focus fire is the counter. Obviously its just OP.

If there was a champion who had a negative tenacity as a passive, then CC could be considered a counter... maybe. Or if a champion took extra damage if it was from more than one source, then focus could be a counter. Other than that, CC and focus just counter everything.

I don't think you can beat Diana as an AD. Fighting her would be you can't dodge her Q, so she can just hit you with that, Lunar Rush to you, and if you try to run, she can pull you back in and repeat the process.

People seem to really love to necro my threads and downvote my posts.