The Red variant of Teacher Bun Bun is slightly smaller. He has 400,000 HP and an attack power of 9,287, making him only slightly stronger than Teacher Bun Bun in the Moon of Empire of Cats Chapter 3 (399,996 / 9,000).
Strategy
Because he is a Red enemy, any strong anti-Red units can take him out in a short time. He is still Floating, so you can also use anti-Floating units for him as well. If you have many anti-Red Cats, defeating this enemy will be easier than defeating his original variant. If you don't, it will be harder, for he has half as many knockbacks as Teacher Bun Bun.
The strategy for defeating the regular Teacher Bun Bun of mainly ranged attackers and crowd controllers like Sanzo Cat or iCat are good against him, however the latter gets outranged, so you will have to time it precisely.
Because he has almost the same stats as Teacher Bun Bun's, most cats will be just as effective against him, but Bath Cat works much better than Dragon Cat when facing him. Strong cats such as Bahamut Cat or Uber Super Rare Cats such as Momotaro work just as well against him, too.