Building off Biles' idea, I thought I'd submit a shemale cow character, if you've got a slot free.
Name: Alex Croydon
Role: Cow (Willing)
Age: 24
Background: Alex always felt like a girl from a very young age, wanting to wear girls' clothes, keep his hair long and generally act like a little girl. His mother supported her only child's decision and he started taking female hormone treatments throughout puberty. As Alex grew older, he knew he wanted larger breasts but didn't want to undergo surgery; Alex's consultant suggested trying a lactation aid, to grow his breasts naturally from the added weight it would cause.
Working as an alternative model, Alex continued to fund his treatments and developed an online fanbase around him being a lactating shemale. Learning of Alex situation, Kathy saw the opportunity to supply her private clients with a unique product and approached Alex with the offer to become a paid full-time cow and promising to ensure Alex's continued supply of his female hormones and the lactation aid. Alex couldn't resist the offer, and between the odd selfie or online commitment, he now spends his days being milked willingly.
Image: Sarina Valentina
Offs: Death