"Mega Man Legends, originally ロックマンDASHシリーズ (Rockman DASH series Rokkuman DASH shiriizu) in Japan, is the third series in the Mega Man franchise. DASH is an acronym for "Digouter's Adventure Story in Halcyon Days". The series features 3D platforming gameplay.
Mega Man Legends
The Misadventures of Tron Bonne
Mega Man Legends 2
According to the sourcebook, Rockman Perfect Memories, the Legends series takes place thousands of years after the ZX series. By this time, the planet Earth is mostly ocean, leaving some islands left for civilization to prosper on. Based on in-game dialogue, the series takes place at least in the year 70XX, if not later.
The player controls MegaMan Volnutt, a teenage digger and archaeologist of sorts who searches underground ruins mainly for Quantum Refractors, which are the civilization's primary source of energy. He was found as a baby on Nino Island at the bottom of the closed-off Nino Ruins and was raised by Professor Barrel Caskett along with his granddaughter Roll Caskett.
Giving them trouble are the Bonnes, a group of pirates consisting of leader Teisel Bonne, his sister (though the booklet says daughter) Tron Bonne (who is also allegedly infatuated with Mega Man), their baby brother Bon Bonne who somehow can drive a large mechasuit (known primarily for his repeated line, "Babu!", which has become a catch phrase among the series' fans), and the 41 Servbots (one of which is only in The Misadventures of Tron Bonne). More trouble is given to Mega Man by the Reaverbots, the techno-organic semi-intelligent residents of the underground ruins who serve to protect its contents."
Source: Wikipedia, "Mega_Man_Legends", available under the CC-BY-SA License.