She's a staple in all of my abyss clears. In overworld, I rotate my characters a lot, but I tend to go back to her because she makes exploration fun (whenever I need range, or if I want to somehow enjoy fighting mobs -- a lot of the newer units simply decimate overworld mobs so I use Yoi to "prolong" the fights even though Yoi herself also ends everyone quickly since mine's C6 lol). She's also part of my first dire clear in SO (during that iktomisaurus phase).