When the Vongola rings take a role, Rain users are direct strikers (for example, swords can be their weapon) and work with limiting the space their opponent can move AND slowing their movement.

My character's ring (Storm) is suited to him because he uses Chakrams as weapons. Storm Ring users contain a lot of power and are the core of the attack. They also attack indirectly.

Another example is Lightning. They have a variety of attacks but I think they rely more on defense.