Using HDMI-CEC, you can connect your TV to your Chromecast so it turns on automatically when you cast content.
Adding a Second Remote to Chromecast with Google TV
A small LED light came on my Chromecast with Google TV remote. What does it mean? My device won't turn on. : r/Chromecast
Chromecast Remote Not Working? Fix It In 5 Steps
Google TV Remote Alternatives: 6 Ways to Replace Your Lost Google TV Remote
Sideclick Universal Remote Attachment for Chromecast with Google TV
3 Ways to Turn On Your TV - wikiHow
20 Things You Didn't Know Your Google Chromecast Could Do
How to set up the Chromecast with Google TV and the voice remote - Video - CNET
20 Things You Didn't Know Your Google Chromecast Could Do
UPDATE: VIDEO] How to control your TV with the new Chromecast remote
How To Use the New Chromecast Remote to Control Your TV
How to Turn On a Sharp TV Without a Remote