Shinji was first revealed to the fandom through a CoroCoro scan that showed him alongside Ash and Hikari. However, his name and role was not revealed until the following week and so he received the fan name "Nugai", coined by Pie as a play on the phrase "new guy". The first scan showed him commanding a Hikozaru.
Several similarities have been noted between Shinji and another rival, Silver. For example, the pose used in Shinji's stock art is the same as the pose in a picture of Silver drawn by Ken Sugimori, down to the angle and position of the hands and feet.
This listing is of Shinji's Pokémon as of the most recent Japanese episode:
- Mukkuru ×3 (Seiyū: 三木眞一郎 Shin'ichirō Miki*)
- Stantler (Seiyū: 小西克幸 Katsuyuki Konishi)
- Azumarill (Seiyū: 川上とも子 Tomoko Kawakami) (Traded for Murkrow)
* No official credit was given for this character.