Might be too late on this but I think you’re on the right lines but the koala facts might be a bit too personal (needing lots of sleep and spending little time on social activities) for the lighthearted nature of this sort of task. My partner did this exercise recently and used a picture of food because he likes food. That’s the level of depth to aim for!
I suggest thinking of one or two words of positive, work-appropriate attributes of yourself and then picking something that shares that attribute. Like your favourite sports team because you’re a team player, a dog because you’re loyal, or the countryside because you love the outdoors. Go for positive, breezy and simple/brief. It’s just an ice breaker so nobody is going to tell you you’ve done it wrong!