hi here's a headcanon I quite enjoy
Ellie jump scaring people by talking
like when they go to visit in Wakanda and then are all like "hey Ellie" and they're signing it for good measure and she just nods and says "sup" and then they have a heart attack
though I like to imagine Ellie jump scaring Rachel at Tony's funeral
she goes off, works on her blueprints to distract herself and Ellie just sneaks up behind her like "yo"