1) Buoyant one 2) Cheerful one 3) Cheshire cat 4) Cheshire Cat, famously 5) Cheshire cat, notably 6) Grin bearer 7) Grinner 8) Grinning person 9) Happy person 10) Happy sort 11) Happy-face presenter 12) His umbrella is bright 13) Human 14) Individual 15) Lady Luck, at times 16) Luck or fate, at times Found on https://www.crosswordclues.com/clue/smiler