Gennō

Genno was a ninja of Kagerogakure, and frequently clashed with Konohagakure in the past. When his village was wiped out Genno was the only survivor. Decades later, with his life failing, Genno decided to resurface his last mission from his village. He began by once infiltrating Konoha as a carpenter. After successfully placing himself within the village, he stole the blueprints of the fort structure around Konohagakure to refine his left over traps from his last infiltration. After the village is left preoccupied with threats of an impending invasion by a neighboring country, it is left up to the Konoha 11 to stop Genno.

Though Genno was first simply interested in destroying the village, he came to appreciate Naruto Uzumaki and the young generation's determination as they managed to find and safely remove his bomb. He then decided to use his trap making to give them an interesting hunt. He amazed the young ninja by how skillfully he faked his death and successfully planted exploding tags all through the village in a chain-effect. After Sakura Haruno, Hinata Hyuga and Ino Yamanaka discovered that Genno was still alive, Genno decided to move into the final phase of his mission. Genno then has his bird drop all the blueprints over the village. While everyone tried to make sense of it all, Genno planted more exploding tags in and on the face of Hokage Rock.

Eventually, Naruto encountered Genno in Hokage Rock and revealed everything, including his plans to blow up the mountain to bury Konohagakure. With his plans finally revealed, he took on the Konoha Genin. He managed to dodge Kiba Inuzuka and Akamaru's attack and used a trick to escape Shino Aburame's insect attack. After using a genjutsu, Genno summoned a giant bird. When Ino went into his mind, she felt pain so extreme that she left it immediately.

Rock Lee then moved in to subdue Genno, but he managed to match Lee's taijutsu. Genno then finally revealed the final face of his plan as he had placed exploding tags in the Third Hokage's face as a trigger for the explosion. After Naruto and Choji Akimichi defeated the bird, Genno decided to finally stop pushing his ailing body and he passed away from injuries that never healed. When Shikamaru explained to the Hokage what had happened he said that Genno did intend to blow up the village when he first arrived. Then he continued saying that then he met Naruto and decided not to blow up the village and had the birds drop exploding tags to play a treasure hunt again like he did with his own son and that Naruto reminded him of his own son.

Abilities
Despite his advanced age, Genno was still a formidable and famous ninja. His greatest trait was his intelligence, which was great enough to even outsmart an entire squadron of ANBU. Like Shikamaru, Genno was adept at perceiving all around him and formulating well though out plans several steps ahead of his opponent that could also involve misdirections, as well as quickly altering his plans should the situation change. His intellect best served him as a trap expert, earning him the the nickname The Trap Master.

Since Genno's style for traps revolved around infiltration of an enemy's territory and stealthily laying explosives, he proved himself to be a very capable actor. According to Shikamaru, Genno's talent for infiltration, whether hiding in the shadows or blending into the environment and disguising his true objective deserved legendary status.

Genno demonstrated to be very crafty and skilled in battle as well, utilizing several expert level combinations from taijutsu, ninjutsu and genjutsu. He would regularly use his trap expertise to make his opponents more hesitant to approach him by rigging himself with poison gases. In terms of taijutsu, his prowess was able to keep up with Rock Lee and presumably only lost because of his failing health.