Exercise caution. Ralf is the most powerful character in the game offensive-wise, but to make up for that, most of his abilities have a drawback associated with them (notably, the ones that do not have a drawback are typically weaker normally). You'll have to adapt your playstyle to counter these self-inflicted drawbacks, but if you can easily handle any debuffs that Ralf inflicts, he will be a solid party member.
Primary abilities[ | ]
The listed strength of the ability is taken when the ability is placed into the lowest slot.