For those of you who can't remember what Iris looks like, here are two descriptions from the books . . .
From Kiki Strike:
"The door shut behind us, and a girl wearing pink pajamas embroidered with ladybugs stepped forward to greet us. She was almost as small as Kiki had been when I first met her, with hair only a shade or two darker. In fact, her resemblance to the young Kiki Strike might have been uncanny if it hadn't been for her healthy complexion and hazel eyes."
From The Empress's Tomb:
" . . . the door flew open, revealing a tiny blonde girl in an oversized white coat. . . . Like Kiki, Iris was unusually small for her age. Unlike Kiki, she possessed a set of cherubic cheeks that were often pinched by strangers who mistook her for an eight-year-old."