|Name:||Iwaizumi Hajime, Iwa-chan (by Oikawa)|
|Relationships:||Oikawa Tooru (childhood friend)|
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Iwaizumi Hajime is a character from the sports anime Haikyuu.
Post-timeskip, Iwaizumi works as a personal trainer.
The most common pairing for Iwaizumi is IwaOi. Iwaizumi and Oikawa are canonically childhood friends, shown in flashbacks together as elementary school students, and call each other by nicknames. (Oikawa calls Iwaizumi Iwa-chan, while Iwaizumi calls him "Shittykawa" and similar pejoratives.) Iwaizumi tends to take care of Oikawa, prompting Oikawa to ask "Iwa-chan, are you my mom?" in episode 19 of the anime.