Effie is very small and has long blonde hair (that is dyed red in the edges) held in two ponytails by red bows and she has blue eyes. She wears heavy mascara under her eyes, giving her a spooky, zombie-like appearance.
In the Street Fighter III series, she is seen wearing a low-cut red dress that is covered in studs. She also wears a large, red collar that is covered by the same protrusions as the dress, and red gloves, also covered in these protrusions. She wears red boots.
In Effie's Shadaloo C.R.I. profile artwork, she also wears a red, low-cut dress though it is not covered in 'spikes' like her SFIII attire. The dress has a single strap over the left shoulder and and a black pattern running diagonally down it. The boots, gloves and collar are now black in color and she has bandages wrapped around her legs. She is also shown carrying a chainsaw. Additional makeup, in the form of two black tears, is shown.
Effie is loyal to Necro and also mimics some of his actions.
Effie met Necro while they were captured by Gill's organization, Illuminati. During that time they became fast friends, and soon lovers. During their time with the Illuminati, they were experimented on as part of the "G-Project".
In 3rd Strike, Effie and Necro are now fugitives after Gill finds out Necro survived. Gill orders his organization to hunt them down. While running away from members of the organization, they reach the top of a train trying to escape out of Russia. Necro fights them off and succeeds. Then Necro realizes that, even though he's a mutant, he can use his abilities to protect Effie.