Well, I have my current first year
Cathy, a Hufflepuff who is fairly social by nature.
Let's see, Cathy doesn't know an enemy and wants to try to be friends with everyone so there wouldn't be a reason she wouldn't get along with Gunlida. Also, she isn't afraid to lecture someone if it is for their own good and her family has been mostly Slytherins till her brother (currently a third year) and her started.
Since Cathy has never been outside London (her home) until Hogwarts it would make sense she would explore the grounds often and no reason she couldn't run into Gunlida out by the lake (though a class is going on there at the moment, so no posting unless you are a 4th year in that class, technically, at the moment).
Any of that peaks your interest?