[Supers] Undetectable As A Super

[Otaku]

This came up while trying to build a Supers character I've had lurking in my head for the last decade or two. The short version is that, when not actively using their Super powers, they don't "register" as a Super to the in-setting means of detecting supers/super powers.

For example, if another character has Detect that works on any trait with the "Super" Power Modifier,* it wouldn't actually work on the Super I've been trying to build unless he's actively using his powers. The same goes any technology that can detect traits with the "Super" Power Modifier.

This effect seems a bit to valuable to argue for it as "fluff". Would it be some form of Invisibility? Or maybe use Alternate Form if the form without any powers already enjoys this benefit? Yes, this means he'd need time to transform into the super-powered version of the character, but I was debating doing that anyway.

*If this isn't a kosher option for Detect, feel free to let me know how to model a similar effect.

Addendum: The character I'm designing is not for any specific campaign. Just an idea that popped into my head some time ago, and something finally got me to the point of "...okay, let's build him in GURPS." The good news/bad news is that means I can't tell you things like "The GM said this is okay." or "That is off limits."