Ayumi Manbosaki is similar to Sunfish Jones, but is much weaker, with about 1/5 the health, slightly lower range, less damage, and slower attack rate with the same animation.
Strategy
Treat this enemy like Sunfish Jones. Defeat the peons protecting this annoying supporter as fast as possible and then destroy her as well.
Her name is a portmanteau of Ayumi Hamasaki, a Japanese singer, songwriter, record producer, actress, model, spokesperson and entrepreneur; and manbō, meaning "sunfish".
Her Japanese name, Ayumi Hamanbosaki, makes the reference even more apparent.
During the first Survive! Mola Mola! collab event, this enemy was simply known as "Peninsula Sunfish".