She has long pale blonde hair with side-swept bangs and three pairs of eyelashes. She wears coral red hoop earrings, white sunglasses with round lenses on top of her head, a seafoam-green triangular cap sleeved dress with white frills, and white slide slip-on sandals with light green bows. Leni is quite ditzy and is very forgetful, absent-minded, and not that bright. Leni is shown to be very compassionate. Leni's shown to be skilled at fashion designing, wood carving, singing, lock-picking, and making smoothies, which demonstrates that while she may not be very bright, she is creative and artistically inclined. She is also very friendly and gets along well with her siblings. Leni has also proved that she can be irresponsibleLeni is also very perky and optimistic. Sometimes, she is too permissive for her own good.She's also shown to enjoy various playful activities, such as using a trampoline.