EX Prilin wears an odd combination of Piccolo's turban and cape (the latter now purple) over Krillin's martial arts gi. He also wears blue armbands and a belt in addition to the Metamo-Ring over his arm. His face resembles Krillin, though his skin is Namekian green and he retains Piccolo's pointy ears.
Regeneration - The Namekian ability to regenerate limbs and health. There are two versions of Regeneration that EX Prillin can use, one being the Regeneration special move while the other is one of EX Prillin's passive Skills. The passive skill version restore some HP every turn. The Special Move version has EX Prillin regrow his arm to restore health though the Special move must be learned and requires ki for EX Prillin to use it.
Unlike his Fusion Dance counterpart, EX Prillin is not hypothetical as EX-Fusion allows people of different sizes and power levels fuse using the Fusion Dance as long as they are both wearing a Metamo-Ring when they perform the dance. Of course it should be noted that Piccolo and Krillin can perform Metamoran Fusion to fuse into Prillin in Dragon Ball Fusions.
Additionally, EX Prillin is classified as a male Earthling while Prillin is classified as a Namekian. This implies Krillin's traits are dominate the EX-Fusion, while Piccolo's traits are dominate the Metamoran Fusion. However despite this EX Prillin retains Piccolo's Namekian ability to stretch his arms and regenerate.