1) Elfin 2) Elflike 3) Elvish 4) Fond of mischief 5) Full of mischief 6) Into shenanigans 7) Like Legolas 8) Mischief-prone 9) Playful 10) Prone to pranks 11) Small and mischievous 12) Small and prone to pranks 13) Spritelike 14) Spritely Found on https://www.crosswordclues.com/clue/elfish
Elf'ish adjective Of or relating to the elves; elflike; implike; weird; scarcely human; mischievous, as though caused by elves. ' Elfish light.' Coleridge. « The elfish intelligence that was so familiar an expression on her small physiognomy.» Hawthorne. Found on http://www.encyclo.co.uk/webster/E/21