In another life, she was Elita-1, an energetic, spunky Autobot Academy cadet. However, a fateful trip to an alien world saw her teammates abandoned her to a horde of alien spiders. Now calling herself Blackarachnia, she hates her new body with a passion. Her loathing of her organic half is slowly driving her insane, and she will do anything to get rid of it, no matter whom she has to crush in her path. Her mutation fueled a newfound hatred of the Autobot cause and a quest for revenge that led her to join Megatron in his war against them. However, she does not appear overly loyal to her leader.
Due to her mutant techno-organic form, she can use her newfound cyber venom to paralyze her enemies in addition to her natural ability to download and mimic other Transformers traits and weaponry for a limited amount of time with a simple touch. Hope nobody tells Lockdown.
Blackarachnia acts differently around robots of the opposite "sex" depending on faction; she's biting and sarcastic towards the Decepticons, but seductive and manipulative towards the Autobots. However, these appear to be but shells worn by a being who desperately wants to be normal again. This desire, however, makes Blackarachnia her own worst enemy, as it's nearly led to her own death.