(Yes I'm well aware it's a really common picture but whatever!)
Maruka is the "leader" of the siblings, she always drags them around on adventures and leaps into danger without a second thought and with a big smile.
She's adventurous but also a bit of an innocent idiot. On the rare occasions that she gets nervous she has a quite a stutter.
Now to the sex details!~
Just like in everyday life shes very adventurous but her innocence tends to get in the way. She often needs to be told what to do but she doesn't let that stop her from trying her best. She's plain ol female and definitely a huge virgin.
Maruka has no preference between genders but gets really attached to people rather quickly.
(P.s. I'm a big fan of futa women or hermaphrodite's if that's the term you know. Its essentialy a woman that also has a penis)
