[From issue 10]
In Nipper's run, he always appeared as a little ginger kid (he sort of reminds me of a younger version of Sid from Sid's Snake in Whizzer and Chips)! However, on issue numbers #10 - #12, he was blonde! Maybe the colourist had a complete blonde moment! (Ba-dum-TISH!)
[Issue 11 at top, #12 bottom]
Then, after he'd gone blonde, he appeared on the cover for the last time before the comic ended. This time, his hair was both light and dark orange!
And finally, the true red-head Nipper we know and love!