Just like it says: a [[snowman]] who looks like [[roma (kancolle)|Roma]] from [i][[kantai_collection|Kantai Collection]][/i].  Compare [[the yuudachi-like creature]].

First seen in [[littorio (kancolle)|Littorio]]'s [[official_art|Christmas CG]]. The fact that Roma did not receive her own seasonal art back then (prior to her Halloween CG,) led artists to joke that she cameo'd in her sister's.
the roma-like snowman