1.
Hanji's eyesight is so bad that she wouldn't be able to tell the difference between Jean and Reiner without her glasses.

2.
Armin hates being called cute. 0.0

3.
Eren loves sweets (mentioned that before, I think).

4.
Levi and Eren prefer to not sing; they'd rather express themselves through body language/dance. They are good at it, though, just like Mikasa.

5.
Isayama says that Titan shifters do not feel pain when their Titan form is injured.

6.
Armin's scream was voted Best Ringtone Of 2015.

7.

And since I'm out of facts after this, I'll go ahead and also post this one even though it'll make eight.

Okay, here's one last one: