you say mundo isn't a tank yet half your items are tank items?

What?

First Skill - Slows, Based of AP or a scaling health percentage

Second Skill - Offers reduced CC and an AoE scaling of AP

Third Skill - Provides an attack damage buff, endgame is +100

Ult - Regenerates 50% HP and gives movespeed

So dude where is the tank in there? Im just wondering. Maybe you could consider his second skill.... but other then that you know what this screams to me?
A chaser, he has a slow, a way to improve his movespeed, a way to prevent CC and finally an AD buff.
That screams DPS to me idk what your thinking

Also he is a MELEE DPS which mean you dont build him squishy, but ffs dont get warmogs [get mallet]

See above post, your MDPS you need to build some survival or you will get torn apart. Its why Yi is so low elo, hes too squishy for the job.

Furthermore

Doran's Sheild and one Health Potion - Could be consider a 'tank' item however there is a trend around DPS grabbing this for the early game boost. So a tank item, maybe.

Mercury's treads - Not a tank item, at all. Too many champs benefit from it [Mundo espically]

Spirit Visage- Not really a tank item either, seeing as how its primary use is improving heals. The MR might be 'tanky' i guess

Last Whisper- Obviously DPS

The Bloodthirster(or two ) - Again DPS

Frozen Mallet - DPS with HP

im gonna respond to Pwnacus with the Same level of intelligence as him:

MUNDO IS A TANK! I am right because I said that in allcaps! Only noobs play DPS Mundo(with absolutely no argument to back it up)! And if you disagree with me then you are wrong because I'm always right! BWAAAHHAHHAHHAA ALLCAPS!

But seriously, he has the second best survivability of any character in the game(following Rammus), he has a lot more DPS building full tank than most other tanks, if not more. An offtank isnt supposed to have CC, he's supposed to absorb damage and be able to search and destroy low health targets under turrets and with teammate protection(because he can ignore their CC). And again, his damage output, he can kill a turret from full health solo with no minions and 5 people on the other team pounding on him...and get away afterwards. I don't know how you are doing it wrong on tank mundo, because I end games 4-shotting squishies with over 6k health.

@Carados and Amatsumero-whatever, thanks for backing me up on this. More people need to be educated on this grave misconception.

@Justdavid: Honestly it's a matter of preference. I like to hit kinda-fast, and REALLY ****ING HARD, instead of Pretty fast, and pretty hard. Both types will work, but i just prefer to see the big numbers and chopping off giant chunks of people's health.

You can also argue that more damage is superior to more attack speed and less damage, because you may not always be able to get off the same number of hits it would take to equal the damage output of a heavy-hitter mundo.

EDIT:

LOL. you must be trolling me now. second best survivability in the game? LOLWUT. when you're getting beaten on by 5 of the other team, mundo's regen means JACK ****. an offtank doesn't have CC? LOL. name one offtank that doesn't have some form of CC. an offtank supposed to absorb damage? also LOL. if they don't absorb the damage, then who will? the Healer? **** YEAH TANK JANNA.

How the hell can you four shot people as tank mundo unless they're level one? if you knew anything about mundo you'd know his damage is pitiful without any boosts, unless he's REALLY low on hp, which you wouldn't be if you were tanking mundo. Also he needs armor penetration which most nooby tank mundos lack.

EDIT: ...Are you high? whatever you're smoking, you gotta hook me up bro.

Personally i dont have the same item build, but i see him more built as an MDPS thats actually viable cause he has some survival.

To me he is the chaser, you dont run right into their faces you come around behind them and
1- Slaughter squishes

2- Chase and kill those that broke off from the fight

Exactly, Mundo is a Tough Dpser, not capable of epic dps like Jax, or epic survibability like shen. He fits squarely in the middle. I see him similar role-wise to Udyr, with a bit less survivability.

A skill used for chasing, which you can still do on Tank Mundo, except you can do it far better due to the fact that you can run through more with far less fear. A tank mundo can dive through 4 people and 3 turrets to chase down someone ghosting away, the DPS mundo dies when he gets seen. This skill also benefits 0% from DPS.

AOE damage that is unaffected by DPS(have you met Amumu?), DPS is unable to use this to full effectiveness because he doesnt have the health or the regen to support it. And have you met Alistar? The best tank of old? He was the best tank because of his built in CC reduction when he ulted...it's a very useful thing to have on a tank.

Best tank right now is Shen. This is very similar to his Ki strike, and why Tank Mundo still does damage. Every single damage item you get(and he's getting several) is exponentially less useful and makes this skill less and less useful. Having a flat damage buff and not a percentage based one has always been and will always be a TANK attribute because of their naturally low AD to start with.

So having nearly double health every fight is a bad thing? Being able to constantly keep pushing without needing to town(again with Alistar). DPS characters as well often stay immobile autoattacking most teamfights until they're in trouble, so the movespeed is completely lost on DPS. Wheras, like I said before, Tank is FAR superior for chasing.

So in Summary, every one of these skills is unaffected by DPS in the slightest(except somewhat the third, but it helps Tank more). And every one of these is very helpful for a DPS-causing TANK.