It's an imagine question,and you can think about anything you like.
I think,Masquerade was born in Alice's body,and has a very close relationship with her,so maybe he is her brother.

it should be

i thinked a lot about it, and guessed its so hard to explain their relationship cause first,Masquerade hates Alice then he help her,i think i will never understand ...

Uhm, yeah, may be Masquarade is like Alice's brother but I like if their relation ship is master and guardian. This is so sweet like a beautiful princess and her awesome knight. Uhm, it made me to remember about Rin and Len in the Evil Saga, but Alice is a daughter of Angel (or may be Daughter of Divine), not like Rin - Daughter of Evil.

Oh,it's a interesting idea.Yeah,when I see Masquerade and Alice,they make me think about Ren and Rin.But,Ren is Rin's twin brother,so I think Masquerade and Alice seem like brother and sister,because a big brother usually protect his young sister.

If you ask me they shod be a cople(I love them as a cople)

they would make a wonderful couple! if they were a couple they would be the best couple in the show! i really want to see Massy in love! especially with Alice! ^^

i agree whit you flaming-wave666

neeeh at all !! friends or sis&bro

yeah but i think sis n bro best!!!