First time I've drew a Leafeon so it may look odd (head is too tall), I tried. :(

Mint is different compared to other Leafeons not just because she has a different fur colour,
while a Leafeon would perform photsynthesis, Mint also lets out a sweet scent which smells fainty of chocolate and mint.
Her obession over sweets may be the reasoning for her evolved form.
Her personality is innocet and sweet, but is unintentionally greedy sometimes.
She's good friends with Amber... until she evolved.