Thomas, from Willenhall, rocketed to fame when he starred in the first season of Gervais's dark comedy After Life.
He played school bully Robbie in a few episodes but is most remembered for being called a "tubby little ginger" by Gervais through playground railings.
The black comedy-drama premiered in March this year on Netflix, and has been renewed for a second season.
Now, it has been revealed that Thomas will star in After Life season two – and the youngster sent Gervais a card to say thank you.
It read: "To Ricky, thank you for letting me pop up in season two of After Life. It was really kind of you to keep your promise. I know you didn't have to. From Thomas. A.K.A tubby little ginger."
The Office actor Gervais tweeted out a photo of the card he received to his 13.3 million followers, along with a crying with laughter emoji.
The tweet has already received almost 55,000 likes on Twitter and almost 5,000 retweets.
Fans have called the youngster "a legend" and a "top kid" and have said they cannot wait to see him on their screens again.