Who do you think is the greatest threat of all?

Me....

Kars

Kars is intelligent, ruthless, and single-minded in his dedication to obtain the Red Stone of Aja. He was stated to have been a genius among the Pillar Men, having been the original creator of the stone masks. Kars also seems to have respect for nature and animals as seen when he killed a drunk driver, who almost hit a puppy, and when he fell off a cliff, he deflected his body to avoid falling on a flower. However, he does later attack a squirrel when testing his Ultimate Form's abilities.
Initially, he appears to be the most aloof and no nonsense of the Pillar Men, rarely smiling and is often the one who has to remind the other two of their ultimate objective. He also came across as mockingly polite, as he offered Lisa Lisa poison in order to die on her own terms. However, after striking Lisa Lisa, he reveals his true nature as a power-hungry sadist, who is willing to trample anyone in his way, no matter how dishonourable the method.

History
Kars was around during the brink of evolution where the people lived underground and strived off the essence of all living things at the same time, failing to reproduce since they had such a long and worthy lifespan.

Frustrated by their ignorance of perfection, Kars wanted the beings to find a way to "tame the sun" and leave the underground to become perfect. In time, Kars created the stone masks in order for his race to become immune to the effects of the sun, and proceeded to kidnap humans in order to test the effects of the stone masks. However, the masks that he created, while capable of turning humans into vampires, were unable to penetrate deeply enough to unlock the pillarmen's full potential, only resulting in some increased body manipulation powers at the cost of greatly increased hunger. Eventually, his race began to fear him for his obsession and sought to execute him due to the increased hunger caused by the mask would threaten their way of life if their use became widespread. Kars was shown protesting their actions before being forced to slaughter the race of Pillar Men himself, including his own parents. Along with Esidisi, he took two children who were presumably the Pillar Men to be known as Santana and Wamuu.

Sometime between his formation of his group of Pillar Men and the beginning of his millennia of rest, he and his comrades would travel to Rome and fight a battle with the ripple users that would end in their victory; how they ended up resting in the wall is unknown.

Who knew that the greatest threat is also fabulous.

4215912
The Universe itself. We don't have defenses against astroids, Supervolcanoes, Gamma Ray Bursts, a supernova going of within 10 lightyears of the Earth, etc.

Seriously, FUND SCIENCE MORE! IT SAVES LIVES!

4215942

Sadly, that's true.

4215946
The scariest things are true.

4215912

The only thing more frightening a regular joe...

Is a man that's out to kill you.

The Ignorance and Apathy of good men.

4216056
Classic. 'The only thing needed for evil to win, is for good men to do nothing.'

The greatest threat?