- Iida’s eyes are blue the anime, but red in the manga
- His favourite food is beef stew
- Iida had two preliminary designs. His character was created during a serialisation meeting and Horikoshi ended up changing the character design when it deviated from the original concept (most likely due to the series’ change of setting to a school). Iida’s first design was older and very different to his current one, while his second is much more similar. Iida’s hero costume was also very different in the concept designs
- Iida’s birthday is the 22nd August
- Iida’s hero name, Ingenium, is also the name of a family of automobile engines!
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