From The TimeSplitters Wiki

Brother Bartholomew
Unlocked by	Default
Species	Human
Size	Normal
Accuracy	N/A
Agility	5
Stamina	5
Fire Proof	5
Shock Proof	5
Default AI	2
Native TimeZone	2052
First Appearance	TSFP Story Mode
Relations	N/A
Games	TSFP

TS1 Gesture	N/A	TSFP Gesture	Raises one arm in air and says "You got it!"
TS2 Gallery	N/A	TSFP Gallery	The U-Genix research scientists try to sanitize the horrors of their twisted research by wearing designer smocks around the labs.

Brother Bartholomew is one of scientists working for Mad Old Crow's U-Genix lab facility. They are responsible for helping creating the early Timesplitters prototypes, known as The Freaks. One of the Brother's gives you the Injector serum to kill off their twisted experiments.