Pádraig Bréanainn Daniels was a human male Starfleet officer of Irish descent who served as tactical officer and chief of security aboard the USS Enterprise-E under Captain Jean-Luc Picard from 2372 to 2376.
In 2372, while a demolitions expert based on Earth, Lieutenant Daniels was part of a team checking Federation installations for possible Dominion explosives following the bombing of the Antwerp Conference. He and his team were transported by the Enterprise from Deep Space 9 to Starbase 375, where Daniels helped uncover a conspiracy led by Captain Ishmael Snowden, in support of the attempted coup by Admiral James Leyton. As the Enterprise had an opening for a security chief, after Linda Addison's replacement by a Changeling infiltrator, Captain Picard offered Daniels the position.
In 2373 Daniels was part of the defense against invading Borg on the Enterprise-E after the Battle of Sector 001.
In 2374, Daniels and his wife, Siobhan Bryn, had a child, and Daniels took a six-month paternity leave from the Enterprise. In his absence, his duties were covered by several officers, including Rowan, Rhea McAdams, and Baeta Leyoro.
In 2375 Daniels was on the Enterprise-E during the mission to the Briar Patch and during the battle against the Son'a.
After the end of the Dominion War in late 2375, Daniels resigned his commission to rejoin his family on the Canopus Planet. He was replaced as security chief by Lieutenant Christine Vale. Daniels warned Vale that the "D-guys" - those crewmembers who had served together on the Enterprise-D - formed a kind of clique which was difficult to break into.