That blonde girl you are referring to is Emeralda Etūva, who actually has green hair in the anime. She's the alchemist chick from the other world. I'd tag it but I don't know how.
Edit yeah anime lover is right, I just quickly looked at the last page with all the girls. She's cut off so I didn't notice her.
Omodume certainly knows how to please a crowd, almost as much as the anime itself. Alas, words can only sully how awesome this is so I'll leave it at that. Viva la Maou!
@AnimeLov3rxXx No...... @Twin182 and @Katsuragi_Hinagiku Yes, you are both correct that Alas=Ramus is a little girl.
This is because that girl is in fact not Alas=Ramus. She is Acies=Ara, Alas=Ramus's sister. Her assumed name in Japan (therefore, going by convention for the other characters, the name that should be used for the tag) is Tsubasa Satou. Hell, it wouldn't have even made any sense for her to be some sort of aged-up version of Alas=Ramus. Did no one notice Emi mentioning Alas=Ramus as someone who is not present while the girl in question was shown together with her at that very moment?
@Demonlogan Not only is there a LN version, as is usual for these things, the LN version is the original while the manga is a fairly loose adaptation.
@Wilfriback See last panel for where Alciel is... I kinda wish we had a doujin for that part, too. I've always had a soft spot for random side characters who never get any attention like Rika.
P.S. Everyone vote down the "alas equals ramus" tag. Seriously. There is at present not a single gallery on this site containing her aside from a single non-H image in an assorted image set.