Re: Mirage’s ultimate
another approach to this could be making his outline while invisible less noticeable like the very slight blurring that halo 3 had. He is after all, made to specifically sneak around the battlefield unnoticed. that is the entire point of his abilities, to trick the enemy into looking one way and sneak around the other and catch them off guard. his invisibility is too easy to spot right now which prevents him from performing his roll effectively.
Some may argue that Wraith is too easy to see too, but to that i say nay, she is meant to be seen. you are fully immune to all damage while in that form. it is meant to avoid damage and relocate out of bad situation. her roll is relocation hence the portal and the speed buff you get when you go into the void.