Take your pick from the classic Chuck Taylor All Star in shoe or boot form or go for the One Star shoe and its suede finish. There’s a choice of Hello Kitty design within those style, some being covered in the cartoon cat, others going for a more subtle approach.
I suppose it depends on how much Hello Kitty you want and how practical you find each shoe for each age. The velcro styles obviously work better for young children and the All Star boots for older kids. Although all are probably aimed at younger children rather than older ones.
Have a look at the full range at the Converse website.