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.
He appears as a playable unit in Metal Slug Attack in the "Pirates Ghost" as a Pack-Shop Unit. Parts of Roberto can be found in the POW Shop. His close range is swinging his machete, and his long range is a few shots from his pistol. His special is a firing combination of his pistol, Heavy Machine Gun, and grenade, aptly named the Roberto Combination.
Roberto and Lightning Fio both make the New Peregrine Falcons team. He is ecstatic to work together with Fio. However, his first team mission lead to a confrontation with Beatriz who was acting as a helpless civilian. Roberto got hit by her freeze ray as a consequence of him having the bad decision of helping her. Because of this event, Roberto is overly cautious when he's near any good-looking woman, believing them to be enemy traps or spies.