You may say 'imouto.'
hiko
tora no hotondo
chisai kitsune
Japanese just use kodomo as in child
'Little fire' translates toΓ₯Β°ΒΓ£Ββ’Γ£ΒΒͺΓ§βΕ½ (chiisana honoo) in Japanese.
小熊(koguma)
The term 'little sister' could be translated as 'imouto', to say 'my little sister' you could say 'watashi no imouto'. But remember, if you are going to refer to someone else's little sister, you must say 'imouto-san', 'san' being the honorific, which are a key element of the Japanese language and etiquette.
小狼 Shō ōkami
You may say 'imouto.'
Ko-Nenko desu ne?
男の子 (otoko no ko)