Siren is an Artifice from Xenoblade Chronicles 2 that Mythra/Pyra directs to shoot its particle cannon down on a target.
Xenoblade Chronicles 2 is available on Nintendo Switch.
In addition to the sweet Myutha figure that we saw at Wonder Festival 2018, Xenoblade Chronicles 2 got another one with an awesome model kit of Siren by Kotobukiya.