At first I started shipping these three just so Yukari wouldn't be left out of my ships of this specific season, but at some point I started genuinely liking it.
I don't think she's much stronger than the average teenage girl. Her throwing darts too hard was just her not knowing anything about the game, and an example of her tendency to physically lash out when she's angry or uncomfortable.
They don't really rip off though, they tend to pop off really cleanly for some reason (my theory is manager kun had most of them as bones, but preserved their memories in one way or another and used new organs and patches of skin found via Frankenstein style and after making each limb attached them together like Legos). So if it does fall of, it's easy and fun to retrieve.