Egor

Ceasar Clown is downright pathetic which makes him kinda hard to hate.

Judge Vinsmoke is overshadowed by bigger scumbags in the same arc, from Big Mom's family who bullied Pudding, to the Vinsmoke siblings themselves. I'd say ichiji and niji did much worse things than Judge, while he merely allowed it to happen.

I'd argue Doflamingo deserves a spot on the list for what he did to Rebecca, his utter disdain for his own brother, and generally scummy tactics he used to turn his victims against each other.

Also, Arlong is just one of the classics.

Though the fishman arc sort of puts Arlong into a bigger context, to a first time viewer he seems like the biggest piece of work in all anime

Lulu has some of the strongest Def and dodge stats on her skill path.

Even stronger than some of the physical characters, in fact.

Yuna is far harder to keep alive, which is probably why most players will put auto-life on her as soon as they get it.

Machi Pichu is great.

I know that many players simply restart a match if their start placement is sub-optimal, but I like to play casually.

One cleverly timed Machu Pichu can really upset the balance of power versus AI games.

I'll concede this will never happen if one assumes optimal plays for all.