Newt- He calls your love, its simple but it just shows you that he really does love you.

Thomas- He's not the biggest fan of nicknames but when he does use them he calls you babe.

Minho- Baby, he calls you this because he isn't the best a being REALLY romantic so he calls you baby

Gally- Gally calls you sailor because it fits with his nickname and because he loves you. 

I will try and post as many preferences and imagines so you guys have more to read. If you have any suggestions them please let me know in the comments below :)