Responses
That was all I could think of the whole time
The protagonist's name is actually kurisu and not christine... basically in japanese when they pronounce "kurisu" it kind of sounds like "christine" and I think that's why everyone calls him like that or "chris" for abbreviation. Also, I think the english guy uses the translation in japanese of his real name or maybe he changed name when he came to japan (there are many possibilities). At first I also thought it was strange but oh well this is just a manga
Weird. The foreign looking one has a Japanese first name while the black haired has an English name.