[There is, after all, a reason why Igor encouraged him to connect with others.]
Each Persona has its own unique attributes. They have their own strengths and weaknesses and in turn, pass those strengths and weaknesses to you. Some can make you swing a weapon harder or be more adept with magic. If your Persona has an immunity to ice, even the coldest temperatures won't affect you, but if they're weak to it, not even the heaviest of sweaters will save you.
Re: [video]
[There is, after all, a reason why Igor encouraged him to connect with others.]
Each Persona has its own unique attributes. They have their own strengths and weaknesses and in turn, pass those strengths and weaknesses to you. Some can make you swing a weapon harder or be more adept with magic. If your Persona has an immunity to ice, even the coldest temperatures won't affect you, but if they're weak to it, not even the heaviest of sweaters will save you.