File:Roberto.gif Roberto Nicola is a playable character in Metal Slug Mobile 4, alongside Leona Heidern. He can be easily identified by his red hair. Roberto makes a second appearance in Universal Metal Slug: Tank Conspiracy, again joined by Leona. He is also a playable character in Metal Slug Team Mission, alongside Leona, Ralf and newcomer Nathalie. He later appears as a cameo character in Metal Slug Defense and later as a playable unit in Metal Slug Attack.