Apollo

Apollo (アポロ Aporo) is a character in the Yu-Gi-Oh! ARC-V anime. He is an Academia Duelist in charge of guarding the Eastern Tower where Rin was held captive.

Etymology
In Greek and Roman mythology, Apollo is the name of the god of sun and light. This fit Apollo's title as "Guardian of Sun". In addition, he is also using a sun-themed deck.

Duel Against Yūgo
When Yūgo arrived at the top of the tower, Apollo told Yūgo to Duel if he wanted to rescue Rin. He Fusion Summoned "Sun Protector", activating its effect to Special Summon a "Protector's Shield Token" and Set a card. When Yūgo brought out "Clear Wing Synchro Dragon", Apollo activated "Protector Adoration" to negate its effects, Special Summon two "Protector Shield Token"'s, and force "Clear Wing" to attack all "Protector's Shield Token"'s or be destroyed at the end of the Battle Phase. When Yūgo destroyed all "Protector's Shield Token"'s, Apollo activated the effect of "Sun Protector" to decrease the ATK of "Clear Wing" and Yūgo's LP by 800 for each destroyed Token. As Apollo reduced the ATK of "Clear Wing" to 100, he wondered if there was any point for it on the field until Yūgo brought out "Crystal Wing Synchro Dragon". He was then defeated when Yūgo used a combination of "Speedroid OMK Gum" and the effect of "Crystal Wing" to increase its ATK to destroy "Sun Protector".