Nidhogg:  (Norse mythology) (also Nidhoggr). Dragon who lived at the foot of the world tree, Yggdrasil, constantly gnawing at its roots. During Ragnarok, Nidhoggr will meet Thor in battle where both will be mortally wounded.
In Norse mythology, Yggdrasil , also called the World Tree, is the giant ash tree that links and shelters all the worlds. Three wells lie at its base: the Well of Wisdom, guarded by Mimir; the Well of Fate , guarded by the Norns; and the Hvergelmir (Roaring Kettle), the source of many rivers.
In the top of the tree was perched an eagle named Vidofnir, and sitting upon its forehead was a hawk named Vedrfolnir. There are other inhabitants of the tree, such as the squirrel Ratatosk ("swift teeth"), a notorious gossip scurried up and down the tree between Níðhöggr and the eagle, forwarding insults between them., Níðhöggr , the dragon who gnawed the roots of Yggdrasil and four deer run across the branches of the tree and eat the buds.
Along Nidhogg, there are many other dragons such as Grafvolluth, Graback, Grafvolluth, Goin and Moin.

Quetzalcoatl: (aztec mythology). Also known as the "Feathered Snake", he was one of the major deities of the Aztec, Toltecs, and other Middle American peoples. Quetzalcoatl would be considered the originator of the arts, poetry and all knowledge. He brought fertility to the land and light to his people. He taught them the art of agriculture, including the cultivation of the maize plant, how to dig into the earth to mine gold and precious stones, the secrets of the zodiac, and the movements of the planets and the stellar system. He was the inspiration behind poetry, learning and all works of art from the simplest sketch to the most elaborate piece of jewellery. The Maya of Mexico knew him as Kukulkán; the Quiché-Maya of Guatemala, as Gukumatz, and sometimes was known as Ehecatl, the wind god.
According to the leyend, Quetzalcoatl and Tezcatlipoca had originally created the world out of the goddess Tlalteutli by ripping her apart and fashioning the world from her pieces. She had to be appeased by human sacrifice in order to continue giving the corn that sustained life.

Scylla: (greek mythology) a sea dragon who lived underneath a dangerous rock at one side of the Strait of Messia. She threatened passing ships and in the Odyssey ate six of Odysseus' companions.

According to the leyend, Scylla was a gorgeous daughter of Phorcys, who loved to swim naked in the sea. One day, Poseidon saw her and fall madly in love. When Amphitrite learned about  Poseidon's infatuation with Scylla, she became Understandably jealous, and decided to punish her husband's lovers. Amphitrite threw magical herbs into Scylla's bathing pool, and when the woman took her bath, at once she transformed into a barking monster with six heads and twelve feet.

 Herensuge: (Basque mithology) Also called Iransuge or Sugaar, it was a dreadful dragon-snake that, according to some tales, had seven heads and can fly, although in most legends it is deprived of wings. it ate cattle, herds, and sometimes, humans, that's why heroes were often given the task to slain it, and there are many legends where this is accomplished. One of the most famous, is the one referring to Teodosio.

This legend tells us about the time when Teodosio de Goñi came back from fighting the Muslims and he had a vision of a pilgrim, who in fact was the devil, who told him his wife was unfaithful to him. He went into a tantrum, came into the house and killed his parents who were lying on the nupcial bed, thinking they were his wife and her lover. As penance for the for double parricide , he had to wander about in the mountains burdened with chains until the chains broke.
Wandering about in Aralar, he got another vision. This time was the appearance of the Devil as a dragon. Teodosio commended his soul to Saint Michael who came in his help, beat the dragon and made it flee to hell through a deep hole. The chains Teodosio was bearing finally broke. He built a sanctuary in honor of the Archangel: this is San Miguel de Aralar Sanctuary, where you can still see the chams through which the dragon fled.

Zu: (sumeria mythology) He was a clever and sneaky dragon that stole the Tablets of Law, the Tupsimati, from the god Enlil. Enlil wore these tablets on him, and they held the universal laws upon them. Zu took them up to the top of the Sabu Mountains where she kept them in her nest. Enlil sent his son Ninurta after Zu to retrieve the tablets. Ninurta killed Zu and returned to Enlil the Tablets of Law, thus preventing the universe from returning to the primordial chaos

Bida: (Africa) Bida is a dragon from a West African epic poem called the Dausi.

Knowing his death was near, the dying King Dinga summoned his eldest son to him to pass on the secret of kingship. The eldest would not come, but his youngest son, Lagarre, did. King Dinga told Lagarre to find nine jars of water as whoever washed in them would become king. He also told Lagarre to take the Tabele drum out into the northern desert and beat it.

Lagarre washed in the water from the nine jars and became king before heading off into the desert. When he struck the drum, the city of Wagadoo rose from the sand. He tried to enter the city but found himself encircled by the dragon Bida. Lagarre made a deal with Bida, he would sacrifice a girl to the dragon each year if Bida would allow him to enter the city and would shower the city with gold, as Bida was able to spew gold from his mouth.

Bida agreed and the annual sacrifice and the prosperity of the city went on for three generations. It was brought to an end, however, when one of the lovers of the annual sacrifice objected to it and went off to kill Bida. Mamadi Sefe Dekote succeeded in cutting off Bida's head, killing the dragon. Bida's head was knocked to the Gold Coast, which is why gold is plentiful there.

Isa Bere: (Africa) Isa Bere lived in the mountains and drank the water of the Niger River, causing a major drought downstream. The peasants were starving and pleaded to King Samba for relief. The king and his bard Tarafe, battled the beast for eight years, , using up 800 spears. Eventually the dragon was killed by a long sword in the heart. The waters of the Niger flowed again.