Goemon Impact was introduced in Ganbare Goemon 2 (SNES). He was a creation of the Wise Old Man, and Goemon was warned only to use him in emergencies. The Wise Old Man also created the Triton Shell, that is blown to summon him. Because General Magginesu stole this object, he was able to get Impact to fight for him.
In Ganbare Goemon: Kirakira Douchuu, he is seen speaking and moving on his own for the first time, and the Wise Old Man seemed surprised. Impact claims to hail from Planet Impact, where all the inhabitants resemble him. This contradicts the previous games, and is not mentioned in later ones.
Many Goemon games involve the main villain controlling Impact at a certain point.
Goemon Impact is modelled after Goemon himself, wearing the same clothes with the same facial features, and even using a pipe as a weapon. However there are some differences. In place of Goemon's spiky hair, Impact is crowned with what appears to be a big blue afro (which hides his generator, according to the music video of I Am Impact! in Mystical Ninja Starring Goemon. Impact's mouth is also constantly gaping, as it appears to be the entrance to his cockpit, as well as his means of firing his ultimate attack, the Impact Beam. Impact has rounded, metal fists so that he may deliver devastating punches, and he has wheels on the soles of his sandals that take on the appearance of rollerblades for purposes of movement.
His more intricate moves consist of different combinations of kicks and punches, as well as his ultimate attack, the Impact Beam which is used mainly as a finishing move.
A robot of similar origin called Goemon Compact appears in the non-canonical game Parodius. It has the head of Impact coming out of a clam-shell makeup compact. After the head takes enough damage, the Impact face will retreat into the compact and come out wearing lots of makeup. In the PS1 re-release Pardodius: Forever With Me, the makeover face is replaced with Ebisumaru.