Marcus and Thomas didn't get along at first, but soon became good friends. Thomas didn't much like Marcus due to his over confidence and his attitude into getting into fighting without a plan. Marcus calls Thomas "Thomas H. Nerdstein" whenever Thomas comes up with a plan or strategy.
Thomas and Yoshi are good friends. Their friendship likely goes back to before the series began judging from some of her dialogue later in the series.
Keenan and Thomas hasn't shown much relationship but seems to have a good friendship.
|Digimon Data Squad|
|DATS Members:||Marcus Damon and Agumon | Thomas H. Norstein and Gaomon | Yoshino "Yoshi" Fujieda and Lalamon | Keenan Crier and Falcomon | Miki Kurosaki, Megumi Shirakawa, and PawnChessmon | Richard Sampson and Kudamon | Homer Yushima and Kamemon|
|Antagonists:||SaberLeomon | Gotsumon | Akihiro Kurata and Gizumon | Bio-Hybrids | Belphemon | Argomon | Royal Knights | King Drasil | Tsukasa Kagura|
| Other characters:||Spencer Damon and BanchoLeomon | Sarah Damon | Kristy Damon and Biyomon | Merukimon | Rhythm | Kosaburo Katsura and Biyomon | Yuma Kagura and Renamon | Masaki Nitta | Other characters|
|Relationships:||Marcus Damon | Thomas H. Norstein | Yoshino "Yoshi" Fujieda | Keenan Crier|
|Other media:||Ultimate Power! Activate Burst Mode!! | The Digital World in Imminent Danger! | Digimon World Data Squad | Digimon World DS | Digimon World Dawn and Dusk|
|See also:||Digimon | Digital World | Digimon Natural Ability | Data Link Digivice | Digi-Egg | List of episodes|