HIM (sometimes spelled Him) is a major antagonist in The Powerpuff Girls. He is one of the most powerful adversaries of the The Powerpuff Girls, as well as one of their more cruel opponents.
The Powerpuff Girls Him talks in a chilling voice that echoes at all times as if in a cave, sounds like Tiny Tim alternating between high-pitched, silly and almost gentle when amused or thoughtful to evil, very sinister and growling when he's angry or enraged.
He made his first ever appearance in "Octi Evil" where he possessed Bubbles' stuffed doll, Octi in an attempt to break the Powerpuff Girls up and he cleverly disguised his own voice to lure her into his trap.
His next main episode was in "Telephonies" where he is one of the villains the Girls visit to investigate the prank phone calls. It is also revealed that he can alter his own voice at will, changing from feminine and chirpy to masculine and angry in just a few seconds depending on his moods. He also formed a "partnership" with Mojo Jojo and Fuzzy Lumpkins when they discovered the Gangreene Gang were behind the calls. It is also shown that Mojo Jojo calls Him sir and has some respect for him.
During "Tough Love", he used his own powers to spread the seeds of anger and hatred into Townsville at night which triggered the residents rising up against the Powerpuff Girls and unwillingly becoming his puppets.
While most villains prefer to destroy Townsville themselves or through their own sheer strength, he often disguises himself or creates psychological events or catastrophes which he uses as an attempt to cause the Powerpuff Girls to break mentally. He has shown numerous satanic forms, most of which are revealed in apocalyptic or hellish situations or realms. These forms, in turn can often greatly enhance his power and cause him to grow to enormous size.
In "Speed Demon", set fifty years into an alternative future and with the Girls themselves having gone missing, HIM managed to gain control of the entire planet including Townsville which in turn, resulted in his powers becoming great and during a fight against the Girls he was able to withstand the full force of their attacks, receiving little or no damage in the process, demonstrating his strength. In this setting, he was also able to change into a much larger and more sinister-looking version of himself.
In "Meet the Beat Alls", Him joins forces with Mojo Jojo, Fuzzy Lumpkins and Princess Morbucks as the 4 evil doers together formed their own band called "The Beat-Alls" which lasted for short time and later became disbanded due to the arrival of the chimp named Moko.
When forced to engage in battle, he is an entity to be reckoned with, as he heralds doom in every direction.
He is undoubtedly the most powerful villain of all, as other villains envy him and even Mojo Jojo, the most persistent of the villains, feels uneasy around him. His powers are so great that in "The Boys Are Back In Town", he was capable of resurrecting and improving The Rowdyruff Boys as well as moving and halting the sun just by waving his claw. The Powerpuff Girls themselves are often unsure how to fight him as well.