Eren:
For You: Baby, Bae
For Him: Babe, Sparkle Eyes
Eren just uses generic nicknames for you since he's not willing to try something new.
Mikasa:
For You: Y/N
For Her: Sweetie, Sugar
She won't call you anything else. Mikasa just likes your name, I guess.
Armin:
For You: Love, Angel
For Him: Bookworm, Baby
He blushes whenever you call him those nicknames, and he tries to hide it.
Levi:
For You: Y/N
For Him: Sunshine, Captain Clean
Unlike Armin, Levi gets annoyed when you call him nicknames. To him, it's babyish.
Erwin:
For You: Darling, Honey
For Him: Prince Charming, My King
Erwin just gives us all a classic husband feel, and these nicknames match with that feel.
Hange:
For You: Snickerdoodles, Snuggles
For Her: Dork, Dum-Dum
Don't question why. Just...just don't.
Mike:
For You: Lovebug, Princess
For Him: Pupper, Handsome
Mike loves nicknames in general. He finds them to be so cute - especially these ones.