This young engineer is rather rude and standoffish, focusing most of his energy on his work for Project Purity. He holds much disdain for James and the Lone Wanderer, viewing them as the cause for the project's indefinite hiatus, and the cause of "impurity" problems. He has no interest nor the time for adventures and fancy plans, he focuses in Project Purity instead. Although a skilled engineer, Daniel lacks decent fighting skills.
Despite his initial rudeness, if the Lone Wanderer later informs him of their father's death, he will apologize for his behavior and display remorse at having been so rude, and will show much grief. Another option is to tell him "You better walk away right now", after escaping with Dr Li and the group. He will reply with "Well, I'm just saying..." with hesitation. This suggests that he is scared of the player, but yet he still attacks the player with standoffish comebacks.
The Waters of Life: Agincourt is one of the scientists who relocate to Jefferson Memorial. While initially rather short with the player, Daniel becomes marginally more respectful if he survives The Waters of Life quest. He can be given a pistol during that quest to assist the player. He accepts:
10mm pistol - "Sure. Beats having nothing, doesn't it?"
Silenced 10mm pistol - "I'm not sure the silencer will do me much good, but I'll take it. Thanks."
.32 pistol - "I guess it's better than nothing. Thanks."
Chinese pistol - "Hmm, okay. Never used one of these before, but I can probably figure it out."
Effects of player actions
If you kill Daniel, Garza will often become hostile to the player, even if you are hidden when he is killed or if Garza is a long distance away from either of you.
If he survives, Daniel will appear in Broken Steel at the Jefferson Memorial continuing his work alongside Alex Dargon.
