Existing antags as SCP or GoIs

Things like slaughter demon or morph sounds like SCPs at their own right
Antags conversion list:

• Abductor - ?
• Blob - ?
• Clockcult - Broken God Cult
• Bloodcult - ?
• Changeling - ?
• Devil - ?
• Sentinent disease - ?
• ERT - MTF
• Highlander - ?
• Monkey fever - ?
• Morph - ?
• Nightmare - ?
• Ninja - ?
• Nuke Ops - Chaos Insurgency
• Officials - Officials as Curators
• Pirate - ?
• Revenant - ?
• Revolution - ?
• Nations - ?
• Slaughter Demon - ?
• Survivalits - ?
• Swarmer - ?
• Traitor - any GoI
• Wishgranter - ?
• Wizard - ?
• Xenos - ?

Yes, as existing in wiki SCP-___/Yes, as completely original SCP/No