In this part of the guide I'm basically going to be analyzing how Nunu adds to the strengths of the different AD carries and why. It's ranked in order of worst synergy to best, but only by personal opinion; I'm by no means the worlds leading expert, I've just put a lot of thought into this. I've divided them into 3 groups
OTHER SUPPORTS WORK WITH THESE BETTER:
The worst synergy with Nunu by far. Blood boil doesn't really help his skillset; he's not an attack speed style champion at all. Plus, with his shield + Q he has a slow already. Makes Nunu completely superfluous. That being said, you can pull off some pretty funny ult party cheese by switching someone into Nunu's ult xD.
From here on things get really close. Let me be clear again: I believe Nunu+any AD carry can work. This is just personal opinion on who works better. With Ashe, I just think with her arrow slow, she doesn't need half of Nunu's utility, and in general I think other supports work better with her.
Corki is a very strong AD carry at the moment; however, I feel he works best with poke comps like Sona or Lulu. He's a bursty champ as opposed to sustained DPS, so other champs would just work better then Nunu with him.
Same case as with Corki for the most part, other supports would just give a better in lane advantage. His W+ Nunu's W though does have it's uses, and I've run this comp successfully before.
A champ without attack speed buffs of his own, he already has a slow too. Basically yeah, ult parties work well, but since some of his attacks are charged, the attack speed wouldn't benefit him as much as others.
Same thing with Corki and Ez where I feel other supports would support Vayne better, but in her case she prefers more all-in supports like Taric or Alistar. Basically, Vayne's harass is to kill people, and other people do that better.
MORE EVEN IN USEFULNESS BETWEEN NUNU AND OTHER SUPPORTS.
She has her own slow, but both combined along with blood boil and her W can really ruin some lives. Healing debuff, permaslow, win.
Your blood boil makes it easier for him to catch axes, and your slow makes it easier for him to continue his harass. QED.
With Twitch's invisibility attack speed buff being already insane late game, plus blood boil just makes it insane. You can easily max attack speed late game on a Twitch, the hard parts just keeping him alive.
Graves is another champ where another support benefits him about as well, but slow combined with quickdraw and buckshot makes for a good poke they can't really respond too.. Late game he's a beast anyway, so it works out.
Slow makes it easy to land boomerang blades, and blood boil + her ult makes for incredible chase potential.
She's another support that works well with others. But her late game Q plus Nunu's W again makes for ridiculous late game carrying.
THESE ARE THE CARRIES YOU PICK NUNU BEFORE MOST OTHER SUPPORTS FOR
Caitlyn + Nunu. Her range makes passively farming a breeze, her escapes mean she never dies, and late game she stomps on people. You may even get a kill in lane because of her free range harass.
This... now this is the good stuff. Chances are you've seen CLG.eu run this. Well, they do it for a reason. Kog and Nunu are best friends. True damage on W, range buff, PLUS Nunu's stuff? You're rarely going to get a kill in lane assuming even skill levels, but you're at LEAST going to stay even in lane, and that means by late game you win if you can keep him alive. Best AD carry to go with Nunu bar none.