This Red variant of Master A has high health, very high DPS, quite long range, and the ability to slow cat units. It still has the same attack rate, but much higher damage, making it a much more powerful threat then Master A even when alone.
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, unless of course you are using Long Distance or Wave Attack units to get rid of it. Awakened Bahamut may also get a hit on Professor A if you get incredibly lucky with timing.
Roe Cat and talentedBondage Cat can be used as another alternative. With high health vs Reds and weaken/freeze respectively, they are both able to perfectly stall Professor A.
If there are many peons in front of him, you can use them as stepping stones for wave, surge, or LD attackers to reach him.
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.
Unused sprites for this enemy were in the game for a long time before his formal introduction. However, he was named "Bloodsucker" and did not have a jagged back, making him visually a Red replica of Master A.