Yokai I struggled to befriend

Everyone, are you enjoying PuniPuni Puzzle today? I'm sure many of you are enjoying the puzzle by befriending many yokai. I'll ask directly. Which yokai did you have the hardest time befriending in PuniPuni? For me, it was 'Mika' from the first Ginga Watch event. No matter how many times I rolled the yokai gacha, she wouldn't appear, and I even considered rerolling my main account. But with a last-ditch gacha pull, I finally became friends with her. I still use her as a main party member.