Supporters in particular have quickly taken to the French Under-21 international and Theophile-Catherine said the admiration was a two way thing.
"Cardiff is a city that is very similar to what I was used to at Rennes. Neither is too big nor too small, meaning there are interesting things to discover and do in both," said Theophile-Catherine to the Western Mail.
"I'm really enjoying my time at Cardiff City and playing for the club in the Premier League.
"We're doing well and I hope that continues, as I'm sure it will.
"I'm really happy that the supporters are helping to bring the best out of me, it's really important to any player that they have that support. The Cardiff fans are always making a lot of noise and they make us want to win even more.
"It's completely different to Rennes, there's no comparison really.
"There's much more atmosphere here at Cardiff."
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