Yes and no. Some robots or their remote controls need batteries, which are not always included, other devices are fully operational from the start and can be freely expanded with gimmicks.
To operate some toy robots, you also need apps. These are available in the Google Play Store and the Apple Store. (Image source: unspalsh.com / Franck V.) For some of them, however, you have to install the appropriate app on your operating device before using them. There are a few robots that can fight with the same robots, so to use this function you need a second one of the kind.
Other extensions are, for example, depending on the device: new game apps, different types of rubber chains for personalisation, a catapult, a tablet for transporting small objects, a xylophone, a painting set, travel bags adapted to the shape and size of the toy or even control using a kind of smart watch.