Fickle

Fickle is similar to Unreliable
Introduced on page 110 of GURPS Powers also has Requires Reaction Roll as a lesser version.
==Combinations==
From Skills to Advantages notes:
:All skills-turned-advantages require a roll,
:and these limitations add a second roll.
:Although not strictly off-limits,
:they’re best avoided as a hassle.
Category:Limitations