Deneb

Deneb, also known as Alpha Cygni, is the brightest star in Cygnus and the 19th brightest star in the night sky. Deneb has some similarities to Rigel, even rivaling him as the most luminous first-magnitude star. This rivalry started out moderately hostile, but it became a friendly rivalry after some time. Deneb is noticeable in the sky, being in two asterisms: the Northern Cross and the Summer Triangle. Deneb is the northernmost star in the Northern Cross with the rest of his friends in Cygnus, and forms the Summer Triangle with Altair and Vega. Deneb has played a part in the reuniting of Altair and Vega, occurring each year on the seventh day on the seventh month, ironically on the same day as Sun Kirby's World of Light completion.

Role in Altair and Vega's Reuniting
Altair was thrown out of the Cygnus Loop by VY Canis Majoris after she had broken a seemingly minor rule of keeping a powerful comet to herself. While wandering through the galaxy, Altair had encountered Deneb. Deneb had promised to care for Altair and her comet and live together in the Manatee Nebula, where flowering plants are suited for growing. One day, Altair stares up at the clouds and wonders what made those clouds so beautiful. Deneb tells of these "borb stars," which are stars that somewhat resemble birds, a type of living creature that the Sun told him about.

When VY Canis Majoris and Mu Cephei place a dense cloud in front of Vega and Altair and carry them to opposite sides of the Milky Way, Deneb sees Altair in distress with her two children, Alshain and Tarazed on her side of the galaxy. This motivates Deneb to use his powers of light to create a bridge of ionized gas and dust, connecting the two sides of the galaxy together. This uses up all of his energy, so this takes one year for him to recharge and gain his energy back. Mu Cephei allowed the two stars to reunite every year on the seventh day of the seventh month, with the two stars being in their respective constellations: Lyra and Aquila.

Relationship with Rigel
Rigel and Deneb were once rivals to each other, although Rigel didn't think of Deneb as a rival, but a friend. Deneb didn't like Rigel at all when he first met him, telling him to go away at all times. The two stars stayed that way until Betelgeuse and NML Cygni convinced the rivals that they should try and get to know each other better. Later after that, Deneb became to warm up towards Rigel, and their rivalry turned friendly.