Rouge is french, so i assume you mean red.
Aka, (a-ka) あか. if you mean rogue, than its Narazumono i believe. if you want to say rouge as in the makeup, i think it is kuchibeni, which translates to lipstick. hope i helped!
to say rouge in Japanese is 口紅 and it is read like kuchibeni hope this helps :)
most likely they say that rouge and knuckles like each other as friends but knuckles dosen't like rouge very much.
" Je suis rouge" pronounced je swee roojeJe suis rouge
rouge
Actually, it's Rouge that wants a family with Knuckles. She's hinted it before in the Japanese version of Sonic X.
red - rouge
Rouge (the make-up) would be: Fucus, Fuci, M or: Offucia, Offuciae, F
Red is rouge in French.
C'est rouge (this is red).
satin rouge
Its "tulipe rouge"
feuille rouge