Mosser is the god of life, any living thing is in his domain.
He among the most mature, right up there with Lucy and Buffxolotl.
The flower is in fact part of him, people unaware often make fun of it, they then get obliterated by the power of a god.
He dislikes that the other gods call the flower "adorable".
He seems perpetually in the mood of "I am so fucking done with this shit" even when he is happy and cheerful.