Board Thread:Support Requests - Getting Technical/@comment-4295751-20180425140444/@comment-34858178-20180425140548

.new {color: #000000 !important;}

Add this ↑ to your MediaWiki:Wikia.css. Replace #000000 with any redlink color you want. Also, if you are using the yellow/green, 1000px wide skin, then you are using the Wikia/Oasis skin, not a custom one (even though customized a bit, yes). I noticed that you said that you were using a "custom skin, not oasis or anything", so that might be misleading other community members IF you are actually using the yellow/green one.