Addressing a female child whose name you do not know?


I'm writing a piece in which a man tells a girl who he has just rescued from
the rubble of a house to follow him. Right now, I just have him saying,
“Come,” but I wonder if there's something idiomatic that I can render as
English (or even a mix of Japanese and English, like the Japanglish “Smith-
_san_.”

_Edited to make this not a translation request_ : I'm thinking he might
address her as 妹ちゃん (which I would render as sister- _chan_ or little sister)
perhaps? Or is there a stand-alone form for ちゃん that he would use?

