>>5489746100% Ame.
Mori's was scuffed but charming and both premiering RIP and doing the jiko shokai rap live made it great. As much as we all like to shit on her, her debut being what it was (despite the technical difficulties) is part of what put HoloEN on the map.
Kiara's was emblematic of the issues she struggled with in her first month and eventually fixed, but it was otherwise pretty standard for debuts. She kept the conversation going and had great energy.
Ina's was about as Ina as can be. It wasn't sensational but it was cute and she demonstrated her talents. Not really much to find fault in, everyone's a little awkward for their debut. After Mori showing off RIP, Ina showing off her illustration skills snowballed the hype
Gura's was kind of dull outside of her salvaging tech issues with "a" and the incredibly song at the end, but she was just nervous and that's normal for debuts. She came through where it mattered and basically paid off all the hype that had been building through the debut relay.
But Ame, holy shit. Ame's debut was just like 40 minutes of inane nonsense from someone sleep deprived to the point of insanity. She didn't demonstrate anything about herself or the direction of her content aside from showing that she wasn't a good singer. It's endearing looking back on it because it clearly didn't affect her growth or how much people like her, but objectively speaking it was among the worst debuts in hololive history.