GURPSよろず

Serendipity
see p. B83
Most heroes benefit from the occasional deus ex machina. Serendipity is for the hero who’s routinely favored by coincidence. It normally works at “plot level,” but certain fictional characters can use their ability actively – in particular, those whose wishes tend to come true.

Alternatives
Use Luck (p. 59) and Super Luck (p. 80) for quantifiable probability control abilities. Those who get what they wish for through divine favor might instead have a deity as a Patron (p. 65) – likely with Highly Accessible and Special Abilities.

New Special Enhancement
Wishing: You can consciously wish for fortuitous coincidences. These must be within the realm of what’s plausible in the current situation. For instance, if you were in prison, you could wish for the jailer to drop his key . . . but you couldn’t wish to be teleported home. The GM is free to forbid anything that would unbalance the game. Normal usage limits apply. +100% if you can grant wishes for yourself and others; +0% if you can aid others but not yourself.

Powering Up
Serendipity works well as part of a divine or spirit power that represents the blessing of supernatural guardians. It might instead belong to a probability-control power (likely psionic) – or even a cosmic power, if the wielder is a deity.
Talent gives a bonus to the first die roll made in conjunction with a coincidence caused by this ability. For instance, in the example under Wishing, it might give a bonus to Filch skill to palm the key in plain sight.