Gaelion

Gaelion is both the dragon Naofumi receives from anonymous donor in 『Chapter 162』 as well as a Fragment of the Dragon Emperor (Wyndia's adoptive father). He is named by Wyndia after her late father, Gaelion. The Dragon killed by Ren was the Fragment of the Dragon Emperor that eventually turned into the Zombie Dragon in 『Chapter 43』. After his Zombie form was defeated, his core was fragmented into three parts. One was eaten by Firo while the another was was absorbed into Naofumi's shield and the last was kept to be used to enhance Naofumi's Barbarian Armor. During a transitional period caused by the need to modify the armor, the core was removed and the young Gaelion mindlessly consumes the piece of the core that then causes him to go on a rampage as the Wrath Dragon. Following it's disposal, the older Gaelion explains that he is a Fragment of the Dragon Emperor and both he and the young Gaelion will share his body. He also explains that their consciousnesses will inevitably merge in time.

Devil of Shield Arc
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Cal Mira Island Arc
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Spirit Turtle Arc
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Slave Supremacy Arc
The older Gaelion explains his and the young Gaelion's combined existence to Naofumi. While the older Gaelion is in control of the body he says that his and the young Gaelion's minds will merge in the future and that even though he has no control over it happening the owner of the body, the young Gaelion doesn't mind it, but rather he desires it to happen. The older Gaelion explains why they flew away after consuming the dragon's core. He says that because of Naofumi's condensed rage Gaelion was set on an anger fueled quest to seek revenge against Witch which could have ended up with the destruction of the kingdom had it not been stopped so early. He also explains that he is a Fragment of the previous Dragon Emperor, incidentally the weakest. c185

Name this arc something pls
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Towards the Legend Arc
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The Christmas of Shield Hero
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The Valentine of Shield Hero
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The White Day of Shield Hero
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Loop 1 to 3 - Tutorial Arc
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Loop 4 - Silt Welt Arc
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Loop 5 - Melromarc Arc
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Loop 6 - Foburei Arc
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Heroes

 * Iwatani Naofumi
 * Amaki Ren

Companions

 * Raphtalia
 * Firo