From The TimeSplitters Wiki

Gretel
Unlocked by	Complete second set of three Story missions
Species	Robot
Size	Normal
Accuracy	N/A
Agility	N/A
Stamina	N/A
Fire Proof	N/A
Shock Proof	N/A
Default AI	N/A
Native TimeZone	2035
First Appearance	TS1 Story Mode
Relations	Gretel Mk II, Gretel (TSFP)
Games	TS1

Gretel (1st Edition), appears only in TimeSplitters 1. A similar Gretel appears in TS3, but she is slightly different and wears clothing. Gretel is one of the two playable characters for the Spaceways mission, along with R108.

TS1 Gesture	Stops playing with a yo-yo and steps aside crossing legs saying "Mission Data now Online!"	TSFP Gesture	N/A
TS2 Gallery	N/A	TSFP Gallery	N/A