No matter how much you look at it though, as far as CS1 is concerned, Towa is boring.
Sure, she's cute, but that's the end of it.
She's nothing to get all ecstatic over, given how most of the cast is more interesting.
Care to enlighten me as to why she's good?
Well, I can only talk about myself but the reason that I liked Towa so much at the beginning was because she is simply a nice and considered person.
You come to this new environment and everyone have their own things to do and care about and most people not only don't care about you but some *cough* Sara *cough* even thoughtlessly burden you with new responsibilities left and right. You are quite overwhelmed and no ones gives a damn about you which is annoying. That is until you see Towa. She is nice, she knows that you are overwhelmed, apologizes for the troubles that Sara has put you through (even though she doesn't have to) and tells you it's okay if you don't wanna spend your free days helping her. And she is not saying these things to simply look nice, she genuinely cares about the well being of other students including you.
Well, Rean ends up doing the requests any way but still it was nice to know that someone actually cares about you and isn't simply trying to use you like everyone else.
As the story goes on and you see more of her you start to notice other good things about her character. She is strong, very hard working, kind, caring, smart... and she just grows on you more and more since the intent behind her actions are very clear and mostly pure.
So is she a cliche character? Yeah, you could say that.
But does that make her bad or uninteresting? No, absolutely not.
Honestly, between all these secretive, tsundere, mysterious, etc, etc, characters that surround you, Towa feels like a nice breath of fresh air with how nice and honest she is.