I personally think Chario is a more popular pairing than MarioTaew. If I remember correctly, there was at least one show back in 2015-2016 that hosted a poll for Channel 3 Koojin and Chario came in second after Yadech. Sadly didn't save the clip, but I think it went Yadech, Chario, Mark & Kim, Great & Matt and Ken & Namtarn (I can't remember if Bargie was on it). I don't really think Taew has a koojin. She has pretty much just been a ratings hit all on her own (obviously she has a p'ek for all her lakorns, but I credit most the success to her performances (e.g. Khun Chai Ratchanon, Nakee)). Same for James Ma, he just excels in the roles the channel gives him. I don't associate any particular n'ek with him. But I guess since Mint was his first n'ek and Chai Ronapee is both his and Mint's biggest success in terms ratings, they think of them as koojin.
But anyways, I am interested to see what event they have planned for these eight koojin.