Yukkuri Merlin usually wanders around looking for Yukkuri Lunasa and Yukkuri Lyrica types while constantly playing its trumpet (assuming it has one). It can drive some yukkuris insane with its music sometimes. On rare cases, if they take any form of damage (physical or emotional) they will go berserk and kill any yukkuri in sight. On even rarer cases they will stay half-berserk for their whole life, often killing yukkuris for even speaking. This makes them different from other yukkuri and Prismrivers.