Ryohei is portrayed as one of the series' protagonists, and is introduced as the energetic member of the boxing club at Namimori Middle School.

His boxing training resulted in his proficiency in hand-to-hand combat, and ability to take and give a huge amount of physical punishment.

Even the Dying Will Shot, which increases a person's strength by removing the body's limiters, has no effect on him since he always lives "to the extreme."

Colonnello also shoots him with a spiritually condensed bullet to unlock his potential, which enables him to unleash "Maximum Cannon", a blow strong enough to break boulders.

His Sun Dying Will Flame, which contains "activation" characteristics, can increase the rate of recovery in his own skin cells, and can also be used to overload other box weapons.

The kangaroo generates boxing gloves that multiply his healing capabilities,[4] and a pair of boots that grants him the ability to fly.

[5] When young Ryohei replaces his older self, he is given the Sun Vongola Box Weapon, The Knuckle of Maximum Break, which hyper activates his nerves and muscles making him much stronger and faster.

In the series' alternate future story arc, after returning from meeting with the Varia in Italy,[11] adult Ryohei finds and delivers the past's Chrome to the Vongola base at Namimori, along with the information he retrieved concerning the Vongola's plan to attack the Millefiore Family.

[15] After being explained the situation, only to comprehend who is the main bad guy, Ryohei undergoes training on how to use the weapons of that era.

He accompanies Tsuna, Gokudera and Lambo to Shimon's hideout where he faces Koyo Aoba in a boxing fight where he demonstrates his Bangle's power.

He also stars in one of the Hidden Bullet light novels called Extreme Memories, which is set before he met Tsuna.