GURPSよろず

see p. B63
Tales of invisible men --but ironically not The Invisible Man, which inspired many of them --usually assume that 「透明」 has Switchable (+10%) and Can Carry Objects (at least +10%). Remember to choose the kind of vision affected.
If the GM wishes to allow “total” invisibility, he may rule that +100% worth of Extended interferes with any sense that 「透明」 could reasonably affect. Common variants include:

Deception:
　A ninja or telepath who mentally compels others to believe they can’t see him has 「透明」 to electromagnetic vision with Can Carry Objects, Switchable, and 「幻惑的」 (p. 111). Deceivers aware of unusual senses might interfere with those, too; add Extended (+20%/type).

Ghost:
　Ghosts that are invisible to mortals have 「透明」 to electromagnetic vision with 「ほぼ常時起動」 (+5%) and Substantial Only (-10%).
Traditionally, ghosts can be seen in mirrors and photographs; they have Visible Reflection (-10%), and can’t take Affects Machines.

忍び Technology:
　A vehicle or robot that’s invisible to infrared and radar --but not the naked eye --has 「透明」 to electromagnetic vision with Machines Only (-50%). The best optical camouflage has Affects Machines (+50%) instead of Machines Only, but still suffers from Fringe (-10%). 忍びy submarines have unmodified 「透明」 to sonar; the best add Extended, Magnetic Detection (+20%). Switchable is uncommon, as stealth tends to be a permanent structural feature.

Superscience クロークing:
　Spaceopera “cloaking devices” give 「透明」 to electromagnetic vision with Affects Machines (+50%), Extended, Scanners (+20%), and Switchable (+10%).

■代替案（Alternatives）
Represent partial invisibility using 「能動迷彩」 (p. 43). Those who create darkness or smoke in order to hide from sight should take 「知覚されにくい」 (p. 64).

■追加特別限定（New Special Limitation）
Fringe: Your ability leaves a faint outline or shimmering. It works normally when you’re standing still, but if you move, others can spot you with a Vision-6 roll and target you in combat at only -6 to hit. -10%.

■パワーアップ（Powering Up）
「透明」 is a key ability for Light and Darkness powers. Electrokinesis could allow a psi to jam signals and become invisible to machines --he might even bend light and become truly invisible (a trick called “photokinesis”).
The addition of 「幻惑的」 makes 「透明」 suitable for chi powers and Telepathy, too. 才能 adds a further bonus to 忍び skill rolls to avoid being seen.