Nintendo announced three new Amiibo coming from the Shovel Knight franchise during their Nindies @ Night stream on Thursday night, and they are amazing. The new Amiibo are Plague Knight, Spectre Knight and King Knight, which are the three members of the Order of No Quarter who have been (or will be) featured in their own campaigns through the Shovel Knight Treasure Trove.
The individual Amiibo look amazing, and will make great companions for my lonely Shovel Knight Amiibo. Their functionality is similar to that of Shovel Knight's: they will provide fairy companions during your campaign, a Spectre Knight armor set that looks especially niiiiiice, and some additional challenge rooms. No release date has been announced for the new Amiibo, however the final DLC campaign that features King Knight — King of Cards — will be released in early 2018.