The overall phrase likely refers to a new version (v10) of a user-generated story or game update involving a character named Rikochan being kidnapped or missing, within an English-speaking loli community context. It could be related to fan-made content like Vocaloid or other creative works.
Based on its structure and themes, "eng loli kidnap rikochan is missing v10 new" could relate to several distinct corners of the internet. eng loli kidnap rikochan is missing v10 new