Here's my take on the character of Invisible Girl in V&V. She should have started out with 2 powers, but due to an error on the GM's part dropped an extra power by mistake and began the game with only the power of Invisibility.

The rule-lawyering player running Mr. Fantastic's character later spotted the error, giving Invisible Girl the Force Fields she could have had all along.

Over time, she trained in Damage with Force Fields and Movement Rate while riding Force Fields.