The First Evil (Buffyverse)
The First Evil isn’t really a character as such – it’s more of an abstract concept, a force of nature and a bodiless, incorporeal entity that uses the power of manipulation to gather its forces in order to take over the planet and gain a physical form. Therefore, it would be something very different for the Avengers to face.
It is said to be the thing that created the very concept of evil and, as such, is extremely malevolent – doing and saying whatever it can in order to both get individuals to do its bidding and/or remove any threats to its existence and plans.
The abilities it does have include being able to possess those who try to carry out magical spells – so if Benedict Cumberbatch’s Doctor Strange was in the Avengers’ ranks, he might find himself in trouble.
Moreover, it can appear as any deceased individual – using this ability to manipulate the living. For example, it could appear as Howard Stark to Tony Stark, it could appear as Peggy Carter to Captain America (after her upcoming death during the Captain America: Civil War movie) or it could appear as Frigga to Thor – and that kind of thing could have a terrible influence on the heroes.
