I just need to know if my Chromecast will work on a new Roku TV I got as a gift, or if I need to return this and pick out a different one. I know that Chromecast does not work on an individual Roku box but what about the Roku TV?
A chromecast will work like any other HDMI source to the TV. Roku TVs may not show the HDMI inputs in the home menu unless the device has been connected and powered up, but after that you should be able to select it or even make it the default on power-up. However, there are only a few things the chromecast will do that the native roku software won't, so you may not use it that much anyway.