Fresh Impostor
Fresh Impostor (might be Mr. Piss) is an orange tabby cat who is named after being so similar to Mr. Fresh in terms of appearance and habits (side-eye and looking at the camera). But one thing that separates him from Mr. Fresh is that he is not picky with food and does not mind if the kibbles aren't fresh unlike Mr. Fresh. After some community discussion, it has been theorized that Fresh Imposter might be Mr. Piss all along (showing comparison below).
In the DeMiaowa's restream, many people were fooled by him as the re-streamer first thought he was indeed Mr. Fresh and some of the Discord mods believed it to be true, only when they realized that that after observing his overall appearance, he was not indeed to be Mr. Fresh.
Fresh Imposter has been known under other nicknames from given from other fans such as, Mr. Stale, Mr. Skinwalker, Mr. Rotten, and Mr. Fraud. It is still a mystery on how he mimicked the likeness of Mr. Fresh so well.