SKILL Wise, which units have the highest damage and best chance to one-shot other units? (excluding EX)

For example Pell has insane damage and I see him one-shotting easily in the league.. So what other units are crazy like him that you think they have an insane damage and can easily one-shot others if landed

We're talking about skills here so that includes all classes (attackers, defenders, runners) not just attackers