The Red version of The Face. Unlike The Face, he has extremely fast attacks, short range and high speed. Shy Boy has 35,000 health at 100% strength magnification and even more when buffed, making him a very annoying enemy in mid-game, so try exploiting his dual-trait weaknesses. When defeated, he drops a good amount of cash.
Shy Boy is very vulnerable to status effects like Slow, because Shy Boy's greatest asset is his high movement speed. While Sanzo Cat and Can Can Cat will get the job done, Enchantress Cat will inflict the Slow effect more safely due to better range and is the best unit to inflict the Slow effect with in instances where Shy Boy is alone in the enemy frontline.
Butterfly Cat (ideally TF) will make this enemy much easier as it delivers massive damage to Floating. However, be careful, as Butterfly has single target attacks.
Sometimes, when Shy Boy is in attack range and a boss is spawned, he moves so fast that he can end up passing under most shorter-ranged cats. This is because cats sent flying back from a boss shockwave travel backwards at 30 movement speed and Shy Boy's higher speed allows him to go past the Hitboxes of Cat Units.