Hello fellow LoL players. This is my first guide. Nunu & Willump is one of my favorite AP support players in the game. I enjoy playing him because he is a great asset in team fights and can deal some massive damage. I've changed this guide a couple times and I'm very satisfied with the choices that were changed and added. Please feel free to give comments/suggestions on my build. All input is greatly appreciated. If you down vote please leave a reason why. Thank you.

3-10-13-Changed items to create more of a support build for Nunu.
3-31-13-Added Straight Ability Power Nunu & Willump.

Pros- Nunu & Willump can cause massive damage with his ult. This can be a game changer in team fights or when soloing a lane against two enemy champions. Nunu & Willump is a great champion for supporting the team and slowing targets for allies to kill.

Cons- Nunu's ult can be hard to get just right. It takes practice to get used to. His ult can also be canceled if thrown ( Volibear, Singed, Alistar, etc.). Nunu also doesn't have a high attack damage. he will lose many one on one fights later in the game if only using his attack damage.

Nunu works great with Thresh, and any champion the can prevent the escape from Absolute Zero.

Glyph's -Use Glyph of Scaling Ability Power. This increases Nunu & Willump's ability power strength.

Mark's - Use Mark of Attack Damage to increase physical damage.

Seal's - Use Seal of Armor to increase his armor.

Quint's - Use Quint of Movement Speed for increased maneuverability.

For the Masteries, I tried to use the ones that will increase Nunu's ability power and movement speed.

I chose to use Flash and Exhaust.

Flash should be used in combination with Ice Blast. First Flash towards and escaping enemy champion and use Ice Blast to slow their movement to close the distance between you and them.

Exhaust is great for preventing an enemy champion from escaping a team fight.

Smite is a great alternative to Ignite if you want to jungle with Nunu & Willump. It is not a great option because of Nunu & Willump's Consume ability. Just bite the neutral monsters and restore some health lost during jungling or laning.

Teleport can be used if soloing a lane against two enemy champions. It allows for Nunu & Willump to return to the front line quickly to prevent turret destruction.

Passive- Visionary
Q- Consume
W- Blood Boil
E- Ice Blast
R- Absolute Zero

Passive- Visionary-After 5 basic attacks, Nunu & Willump can cast a spell for free. This is a great way to conserve mana in battle. This works great with all the abilities. One can never go wrong with a free spell.

Q- Consume-allows Nunu's Yeti to take a bite out of a minion or monster, dealing damage to that creature and also restoring some of Nunu's health. This is great for restoring health after a battle with an enemy champion. Nunu doesn't have to leave the battle field and return to base to gain health. Just be cautious and consume minions to regain health.

W- Blood Boil-Increases allies attack and movement speed for 15 seconds. This ability can be cast on fellow allies or on Nunu & Willump himself. When cast on allies, Nunu & Willump also gains the affects of Blood Boil. So cast on allies to share the benefits with them. This is great to increase attack speed for turret destruction, and also to chase down fleeing enemy champions.

E- Ice Blast-Nunu throws a ball of ice at an enemy dealing damage and slowing the targeted enemy's movement and attack speed. I suggest maxing this ability first since it gives Nunu & Willump a ranged attack, instead of just having to go and hit the targeted enemy head on. This deals a fair amount of damage at the beginning of the game and is great in team battles when an enemy is trying to run from the battle.

R- Absolute Zero- Channels for a maximum of 3 seconds, slowing enemy movement and attack speed. Any enemy caught in the channeled area is dealt damage depending on how long Absolute Zero was channeled for. To stop the channeling earlier, right click to move Nunu & Willump and the damage dealt will be a percent of the maximum damage depending of the time spent channeling. The best way to get your Ult fully channeled it to get the enemy champions to follow you into the bushes. Once in the bushes and the enemy start to come in, activate Absolute Zero be the time they realize what is going on it will be too late for them to escape the blast range. After the massive amount of damage has been dealt most champions will be close to death. Use Ice Blast to hit and slow them and finish them off.

I feel that Nunu & Willump can be utilized in any lane.

When paired with the proper allies he can be a great support for the team.

As stated previously, avoid going against enemy champions that can cancel Nunu & Willump Absolute Zero.

In conclusion, Nunu can be a fun character to play. He has a strong ult and can be great in assisting in team fights.

Thanks for reading. Any comment or suggestions please let me know.