Teppei serves as a Saiseiya, specializing in rare ingredient revival and protection under mentor Yosaku. He inherits the "Knocking Master" title from adoptive grandfather Jiro, shaping his combat and ethics. Witnessing environmental ruin in a valley Jiro overhunted drives his conservationist commitment.

Physically, Teppei sports green pompadour hair and a prominent forehead-to-neck scar from a clash with Joie. His signature green attire includes long sleeves and pants, featuring three earrings holding revival liquids. Post-timeskip, his clothing darkens, adding cloaks and mouth coverings.

Initially reserved yet intermittently verbose, Teppei strictly follows a creed against hunting endangered species, preferring subduing or healing them—sometimes reviving dangerous organisms indiscriminately. After Joie defeats him during the Four Beasts Arc, NEO brainwashes him via "Taste Change" microbes, twisting his personality to ruthlessness. He demonstrates this by crushing Komatsu’s heart, later revealed as covert resistance to Joie’s control. His true allegiance surfaces when he revives and enhances Komatsu’s heart within a Back Channel, trusting the Four Heavenly Kings to retrieve PAIR and save Komatsu while countering NEO.

Teppei’s combat prowess rivals the Four Heavenly Kings, using Knocking techniques to immobilize targets non-lethally. Variations include "Medium" (celiac plexus strikes) and "Well Done" (motor nerve paralysis). His heightened senses detect overlooked presences, and his speed generates afterimages. Post-timeskip, he manifests vine-like Appetite Demon arms enabling plant manipulation and space-time traversal via Back Channels. These stem from consuming Acacia’s Full Course: AIR awakens Gourmet Cells in his left arm, PAIR in his right, ANOTHER enhances taste comprehension, NEWS unlocks Back Channels, and GOD activates brain-based powers.

As a Saiseiya, Teppei utilizes equipment like Protection Tree seeds for structural stabilization and heart-restarting fluids. His revival techniques obliterate and restore organisms instantly, upgrading their qualities—exemplified when enhancing Komatsu’s heart to withstand Appetite Demon strain. In the GOD Arc, he confronts foes like Atom (a Blue Nitro impersonator) and Pair, restraining the latter while sealing Atom’s energy. He aids planetary stabilization under Jiro’s guidance.

Teppei’s familial ties connect to adoptive great-grandfather Acacia, great-grandmother Froese, granduncles Midora, Ichiryu, and Starjun, and adoptive granduncle Toriko, exposing him to advanced combat and culinary legacies.