Which NPC can be pickpocketed with a 100% success rate above level 100?

In the OSRS Trailblazer League the "Skilling Prodigy" Relic allows you to get a permanent skill boost of +12 to all your non-combat skills. Now in the base game Knights of Ardougne are a very popular thieving training method since at level 95 it is no longer possible to fail pickpockets when the Ardougne Medium diary is completed.
If I understand the current league mechanic correctly, theoretically it would be possible to boost thieving up to level 116 (+12 from the relic and +5 from a Stew).
So what is there a higher level NPC from which it's possible to steal? (At level 116 with both the Ardougne Diary and the Thieving cape if necessary.)
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What level do you stop failing pickpocketing?
You stop failing pickpocketing knights at level 95 with the diary perk.What is the fastest way to level up Thieving in Runescape?
The best route is to loot the safes upstairs in Varrock Palace (requires a lockpick or hair clip and 65 Thieving), the one in Edgeville, and the two in Lumbridge. This can provide up to 300,000 experience an hour. Ensure that you click on the safe when it flashes blue for quicker experience.How do I increase my pickpocket chance Osrs?
Different tiers of the Ardougne diary grant an increased chance to successfully pickpocket various NPCs. Completion of the Medium Ardougne Diary increases the player's chance of success when pickpocketing by 10% within Ardougne, whereas the Hard Ardougne Diary extends this bonus to all of Gielinor.How many times can you pickpocket in an hour Osrs?
At level 85 thieving with the hard Ardougne Diary completed, the player will have a 37.3% chance for a successful pickpocket, meaning that the maximum theoretical amount of pickpockets is roughly 347 per hour.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Karolina Grabowska, Karolina Grabowska, David McBee, Artem Beliaikin