Derek is shown to be a fragile-looking and unattractive cat who is wearing the same uniform as Eric but with glasses, a bowtie and a hat.
- It is assumed that Derek is Eric's younger brother as D in his name is before E in Eric's name.
- Derek is shown to like Kitty too.
- Despite his one time appearance, few Kudley fans have taken a liking to him as he is nothing like his brother.
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