No, IchiKara is huge with JP and western fans, just in their own ways. But also Ichimatsu is incredibly popular, followed by Jyushi. In fact, when I went to any Japanese import store that had matsu merch, the only brothers you could get stuff of outright were Oso, Choro, and Totty - all the Kara, Ichi, and Jyushi stuff got snatched up quickly (so if anything you only had the blind boxes - my poor wallet).
Don't feel too bad about "not being there." Word is going around that the dub is still being worked on, it's just a lot of work, so who knows.
On twitter some artists I like are>ongsengman (really stands out for their 80's -kun-inspired style - it may look simple at first but there's a hell of a lot of skill involved)>ohkaxxx (pic related and just really nice in general, their use of orange on the bros make them look nice and warm)>fufufu_matsu (amazing use of colour, sometimes colours lineart by the aforementioned)>hakoboxx (cute wiggly artstyle, does nice watercolours too)>nilllirr (THE cutest matsudog art on the planet, you will "hnng" at how adorable their art of Kara and Karadog and the rest interacting again and again)
I'm mentioning these because they're all still active and continue to draw matsu fanart!