The Delfino di Pioggia, nicknamed as Alfin, is a Rain-attribute Animal-type Box Weapon owned by Basil. Its design is unique even among the Box Weapons left by Geppetto Lorenzini and is considered a prototype Box Weapon furnished with an advanced communication system.
Basil acquired it along with his Ring and the Helper's Book in Spain after being sent ten years in the Future. Alfin and Basil fought the Millefiore Famiglia forces approximately 8 times in the 10 days that it took Basil to reach the Vongola Underground Base.
The Delfino di Pioggia is highly intelligent and is capable of achieving mutual understanding with most Animal-type Box Weapons. It can communicate and coordinate with other Animal-type Box Weapons to deliver complex combination attacks.
- Dolphin Edge
- Dolphin Pulse ((ドルフィンパルス, Dorufin Parusu?))
- Special Attack ((特攻, Tokkō?))
- Swimming Blade Dance ((泳舞斬, Eibuzan?))