Dexter has brown hair and eyes, and is not seen without his glasses. He usually wears his Duel Academy uniform but when out of uniform he wears a white collared shirt with a red bow tie and suspenders, navy blue shorts, white knee socks, and brown dress shoes.
He and Leo went to the Daimon Area to duel the Black Rose. Dexter had modified his Deck specifically to duel against her. When he first meets Yusei, he was afraid of him due to his criminal mark, but began to admire him once Leo told him he had customized his and Luna's Duel Disks to fit them and was strong enough to enter the Fortune Cup.
Pre-World Racing Grand Prix and WRGP
Dexter has enlisted into The New Domino City Duel Academy along with Leo, Luna and Akiza. He was in danger of being expelled by the vice-principal, Rudolph Heitmann, who despises them for having low grades and low-Level monsters. He is saved after Yusei defeats Heitmann in a Duel.
Later, he accompanies Leo and Luna into a supposedly haunted forest. Leo wants to turn back, but Dexter reminds him that it was his idea to explore the forest in the first place, and the group continues in. After Luna and Leo lose him (Leo was chasing after Luna when the latter fell into a trance), Dexter runs to Poppo Time to tell Yusei what has happened.
The only shown card from his Deck is "Batteryman AA".
During a school lesson, he was seen using a copy of "Armed Samurai - Ben Kei".
Reverse of Arcadia
In Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia, Dexter uses a Fairy Deck titled "With Intelligence".
- Airknight Parshath
- Barrier Statue of the Heavens
- Harvest Angel of Wisdom
- Herald of Purple Light x2
- Herald of Green Light x2
- Hysteric Fairy x3
- Neo-Parshath, the Sky Paladin
- Radiant Jeral x2
- Royal Knight x3
Over the Nexus
In Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus, Dexter uses a Deck similar to the one from the from previous game titled "Angel Inside".
- Yu-Gi-Oh! ARC-V episode 98: "" Cite error: Invalid
<ref>tag; name "ep98" defined multiple times with different content
- Yu-Gi-Oh! 5D's episode 14: ""
- Yu-Gi-Oh! 5D's episode 67: ""
- Yu-Gi-Oh! 5D's episode 70: ""
- Yu-Gi-Oh! 5D's episode 104: ""
- Yu-Gi-Oh! 5D's episode 119: ""
- Yu-Gi-Oh! 5D's episode 125: ""
- Yu-Gi-Oh! 5D's episode 150: ""