The Red variant of Master A. has high health, very high DPS, quite long range, and the ability to slow cat units. While not too much of a threat by itself, it can become deadly when backed by strong enemies, such as the Gory Blacks and Angelic Gories in Pecking Order.
Professor A.'s biggest weakness is units that outrange it. Li'l Nyandam and the area damage from Crimson Mina and Prisoner Cat are all great no-gacha ways to get rid of it. If Professor A. has support, try and bring it down first as it's far, far easier to kill an unprotected Professor A. than one with endless waves of tough enemies to fight for it. Awakened Bahamut may also get a hit on Professor A. if you get incredibly lucky with timing.
Roe Cat is another alternative. With high health vs reds and weaken, he can perfectly stall Professor A.
A sensual novelist who became very famous for his book "Eguchi High School", which describes a girl's puberty. He is currently teaching at the University of Yamarashi as a professor of literature. Of course, no experience with a woman.