Ok I will admit Freakyz design was based around a character from monster high only because I fell in love with the color's on him xD (see monster high Freaky Fusion) But Freakyz back story is completely different :T

Long Story Short.... Freakyz Has no cutiemark, in fact Freakyz was the creation of a wizard/elder unicorn named Dazzle The Stash... Who was known to be a great enemy of starswrill the bearded. He Created FreakyZ Purely by mistake he wanted to create a zombie Pony army to take over all of equestria, but he ended up accidentally fusing his assistant with a zombie. Angered by his mistake he locked the creature away in a volt. (Many Years later) He's discovered by BREADCRUMBS :D!... thats all I got...