Toys and costume props on a plane
A toy label does not decide the bag
At a US checkpoint, TSA allows an ordinary toy lightsaber in carry-on and checked baggage, while a foam toy sword is listed for checked baggage. A toy that resembles a real firearm or weapon needs closer attention: TSA does not allow realistic weapon props through carry-on screening. Pack a toy gun in checked baggage and check any caps, projectiles or gas cartridges separately. See the TSA item list for the exact toy.
Modeling supplies and powered toys
TSA lists Play-Doh for both types of baggage at US checkpoints. A craft knife, sharp modeling tool or tube of paint is a different item. Close compound and paint containers to prevent leaks. For acrylic paint, check the product's ingredients and container size; a dry watercolor cake is different from a liquid paint tube.
For a toy robot, turn it off and protect its switch. The FAA's battery guidance requires spare lithium batteries in carry-on baggage, individually protected against short circuits. If your carry-on is checked at the gate, take spare cells out first.
Games, models and display props
Trading cards, tabletop figures and a plastic flying disc need protection from bending or crushing, but they do not become weapon props simply because they are toys. Check a plastic model kit for loose blades, adhesives and paint before packing it. Artificial skeleton bones can be packed as a display prop; assess any attached metal spike or realistic weapon separately. TSA screening rules apply to departure from the US, while your airline sets cabin size limits.