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Character:

Guren is one of twelve shikigami in service to Seimei, who gave him his current name, after he pledged his servitude. His original name is Toda. However, the other shikigami still addresses him by original name. Only Seimei and Masahiro call him Guren.
The form he takes most of the time is a mononoke, whom Masahiro named Mokkun. Because he's invisible to anyone without a spirit sense, Mokkun frequently plays tricks on people who annoy him, much to Masahiro's chagrin. It was also shown in the anime that Guren dislikes babies because, according to him, babies often cry for no reason.

Source from Wikipeida