What if Instead just a "hologram" Echo was able to adapt her body to the design of the targeted enemy (FanArt by Dana Pull on Artstation) : r/ Overwatch
The Overwatch Echo Debut Has Been Confirmed - Siliconera
Echo - Overwatch Wiki
Overwatch's Echo has concept art ability brought to life - Dexerto
New Overwatch hero Echo is live on the PTR | GodisaGeek.com