From The TimeSplitters Wiki

Sergio
Unlocked by	Challenge > Behead the Undead > Sergio's Last Stand with Silver or Better
Species	Human
Size	Normal
Accuracy	5
Agility	3
Stamina	9
Fire Proof	n/a
Shock Proof	n/a
Default AI	4 stars
Native TimeZone	Unknown
First Appearance	TS2 Arcade Mode
Relations	N/A
Games	TS2

TS1 Gesture	N/A	TSFP Gesture	N/A
TS2 Gallery	The circus strongman, Sergio's incredible strength is tempered with a compassionate personality and love of life. He likes to tend his herb garden and collect first editions.	TSFP Gallery	N/A

Sergio is one of the performers that works in the Circus. He wears rather revealing clothing. According to Challenge Mode one of his acts involves shooting Flaming Zombies.

Challenges

Sergio stars in Sergio's Last Stand and Rocket Man in TimeSplitters 2.