Here's what makes Edgar the antagonist:
* Greedy: He's driven by greed and wants to get rid of the cats to claim their inheritance.
* Manipulative: He uses his position as butler to his advantage and tries to trick the cats into leaving the house.
* Cruel: He attempts to get rid of the cats by taking them far away from home, leaving them to fend for themselves.
Edgar's character is interesting because he's not a stereotypical villain. He's not overtly evil or menacing, but his greed and cunning make him a formidable threat to the cats.