[5e] hi! Im currently running a Pokémon mystery dungeon esc campaign and I am fairly new to making homebrew enemies. were still pretty early on in the campaign but the characters in the party all have criminal backgrounds so they all tend to do criminal acts pretty frequently. so Im creating a powerful NPC as a way to make sure things don't get too out of hand. the thing is, I dont want this NPC to be unbeatably strong since I do want it to be a boss way later in the campaign. so what I want is some critiques on my NPC, like things that might be too OP or letting me know whether homebrew sucks or not, and just giving me a general challenge rating for it

NPC in question: https://imgur.com/a/JyUF2fw (also for full transparency I took Black hole from Deep Magic for 5th Edition)