He is voiced by Daisuke Kishio in the Japanese version, and by Derek Stephen Prince in the English version.
Jeremy is a tall teenage boy with lightly tanned skin, spiked dark brown hair and brown eyes. He wears a forest green button-up shirt with two pockets on the chest and the sleeves rolled up over his elbows over a light blue T-shirt. He also wears light brown cargo pants held up by a dark brown belt with a silver buckle, and brown and dark green saddle shoes.
After returning from the Digital World, Jeremy changes into a pale yellow collared shirt with short sleeves, a dark green tie, light grey pants, and light brown shoes.
One year later, he wears a light cream button-up shirt with a green collar, breast pocket and trimmings with the sleeves rolled up over his elbows. He also wears light blue jeans with two big pockets, white and brown saddle shoes, and a red bolo tie set with a turquoise jewel slider set in a golden frame.
He calls himself "Mikey's eternal rival." He is afraid of heights, but is a capable leader and leads Fusion Fighters when Mikey is incapacitated. Jeremy has a severe crush on Nene Amano, which can sometimes lead him to make a fool of himself. He seems to have a special bond with the red Pickmon, and in battle, Jeremy often uses the Rare Star Sword. He seems to constantly agree with Angie about Mikey's rash behavior and crazy decisions.
During their travels, they meet many friendly Digimon who join their cause. They also encounter the rival group Blue Flare. They face the evil minions of the Bagra Army as well as Team Midnight. They allow Midnight's former general Nene and her Digimon friends, which consist of Sparrowmon, Monimon and the Monitamons, to join their group after SkullKnightmon casts her aside once she outlives her usefulness to him.
After MegaDarknessBagramon's defeat, Jeremy moved to another town. Mikey tried to hide the existence of DigiQuartz from him and Angie in order to protect them, but Mikey tells Jeremy after being attacked by SuperStarmon. Upon learning about the Digimon hunt, Jeremy bursts into Mikey's room, asking Mikey where he can find the Old Clock Shop Man so he can get a Fusion Loader and join the hunt. In the fight against Quartzmon, Jeremy receives a cerulean Fusion Loader, and owns Ballistamon and Deputymon as partners.
- His Japanese Voice Actor, Daisuke Kishio, who also voiced by Fuyuhiko Kuzuryu in Danganronpa 2: Goodbye Despair, Loke in Fairy Tail, Kurama in Kamisama Kiss, Tsukune Aono in Rosario + Vampire, Cabba in Dragon Ball Super, Jet the Hawk in Sonic franchise, Noel Kreiss in Final Fantasy XIII-2, Etzali in A Certain Magical Index, Iceburg (young) in One Piece, Hotsuma in Shinobi, MailBirdramon, Blastmon, Reapmon and Beelzemon in Digimon Fusion, Steely Dan in JoJo's Bizarre Adventure: Stardust Crusaders, Jadiete in Sailor Moon Crystal, Richard Wellington in Ace Attorney, Doryun Sanbu in Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger, Jeice in Dragon Ball Z Kai, Sima Zhao in Dynasty Warriors 7, Nimura Furuta in Tokyo Ghoul:re, Quillfire in Transformers: Robots in Disguise, Bucky Barnes in Marvel Disk Wars: The Avengers, Bat in Fist of the North Star, Bentley in Sly Cooper, Bumblebee in Transformers Animated, Komatsu in Toriko, Edge Maverick in Star Ocean: The Last Hope, Remy in Ratatouille, Kyle in Suikoden, Dave in Dave the Barbarian and Erol in Jak II.
- His English Voice Actor, Derek Stephen Prince, who also voiced Shino Aburame in Naruto series, Uryū Ishida in Bleach, DemiDevimon, Digitamamon, Piedmon in Digimon Adventure, Veemon, Ken Ichijoji ni Digimon Adventure 02, Impmon in Digimon Tamers and Grumblemon in Digimon Frontier.