Edits:
Common Heterochromia
The timer's off by a bit
I like this little guy! I honestly think that neon colors work really well with greys and whites when used as accent colors.
here's a picture of a tuxedo cat, what this HIFEC is based on: https://www.tuxedo-cat.co.uk/wp-content/uploads/2016/12/shutterstock_138013388-300x300.jpg