Evil HEROs
The Evil HEROs take their inspiration form the Elemental HEROs strangely enough. They are supposed to be corrupt and evil versions of the fusion monsters that they have at their diaposal. They also have an underlying tone throughout. They have version of fusion monsters that use Elemental HERO Burstinitrix. She was the original fire HERO, and fire is sometimes seen as evil. Therefor the fusions that use her resemble her much more than the other material.
The Evil HEROs do not really have a unique playstyle as they are mant to be played with Elemental HEROs. So they more or less foloow the same strategy of just making fusion monsters with the required materials from your hand or graveyard. Their fusion monsters have fairly similar effects to their counterparts, and their main deck monsters are just better versions of their counterparts.
The Evil HEROs just recieved their first new support since they were first released. It gave us a great new generic fusion monster, and a great new fusion spell searcher.