+1 to dexterity
-1 to intellect

+1 athletics
+1 agility

leperechauns can live as long as they choose to but and become adults at 180yr but after 1000 or so years leperechauns lose alot of their will to continue

1-4ft mostly sitting around 2ft, your size is tiny unless 3ft+ then your size is small

walking base is 30ft, swimming base is 20ft, climbing base is 5ft

Leperechauns love mischief but are also empathetic often around chaotic good to lawful evil but almost never neutral

you can speak, read, and write sylvan, you can speak common and can read and write a little but not fluently

You have advantage on saving throws against being charmed, and magic cannot put you to sleep. 

leperechauns are able to inhabit the same space as any creature larger than them

Rainbow vision; all colours are amplified to you and this allows you to perceive more colour and light in dark places but the vision gets progressivly worse the further away the leperechaun looks
(anything past 10ft loses fine detail, 20ft loses most detail, 30ft just shapes but perceivable, 40ft you can see something their but you can't make it out 50ft would just be a blur of colour, 60ft you can't see anything at all)

4 Leaf Clover lover; if you eat a 4 leaf clover it will have the effect of a short rest and will turn your next short rest into a long rest

Luck; when performing an action you may roll a D4 minus 1 and add it to your other die. But if you roll a 1 you must roll the D4 again but minus the D4 from the other die
at Lv 10 you may opt to use a D8 but instead of just 1 now 1 and 2 mean you have to roll to minus