Chocola and Vanilla are twin catgirls from the visual novel, manga and OVA anime series known as Nekopara.
They are the two youngest catgirls from the Minaduki Family. The pair of them were found as strays on the side of the road by the Minadukis.
Chocola is cheerful and energetic as described as "happy-go-lucky" by Kashou himself. She doesn't often get upset and when she sometimes does, she swings back to being cheerful as usual, especially when she is sad about something. She can also be curious and have a childlike outlook on things.
Vanilla is calm, stoic and quiet. She doesn't express her emotions often which makes her of some sort of a kuudere character, opposed to her sister's cheerful, playful and energetic personality. She also loves her twin sister and will always accompany her.