1987: Adventure Boy/Big Brother Ponies
TEX
Yellow shire pony with dark pink mane and tail (dark blue streak in mane), aqua and pink cactus symbol.
Aside from having a seriously terrible cowboy accent in the cartoon episode, "Somnambula", and a small fixation with a lassoo...Tex didn't really make a huge impression on me in the comic. He and the others were discovered by Princess Ruby and her long suffering dragon in a comic story that was reprinted in the Favourite Stories book from 1987, and he featured on the cover of the 1987 UK Pony annual.
He was also re-released in the second year set with three new characters - Barnacle, Chief and Wigwam. He was named the same in both the North American and UK sets.