Tourists encounter a new shop, a gift shop, on dungeon level 1, possibly built around the entrance stairs. The gift shop stocks mostly useless items like fake Amulets of Yendor, juice and candy bars at high markups, plastic figurines of low-level monsters, and T-shirts (which are much less of a big deal to the Hawaiian-shirt-wearing tourist).

Randomly generated statues and figurines (and masks in variants that have them) should use a higher effective difficulty when choosing the associated monster species, because using low-level monsters is boring and typically useless to the hero.

This should probably also apply to statue traps, since they are not very threatening at the moment.

You should be able to wish for figurines of unique monsters. If they activate, they will have no effect , so they would just exist to be something you can wish for as bragging rights.

Artifact figurine, the gimmick of which is that it will always turn into a pet if not cursed, and the monster it turns into will fight anything without fear and maybe also has some extra buffs. When it dies, it reverts to the figurine, which immediately has its artifact cooldown set and can’t be applied again before the cooldown ends.

The inspiration for this idea was the Guenhwyvar panther figurine from the Legend of Drizzt, so possibly this artifact could just be named Guenhwyvar and be a figurine of a panther, which already exists in NetHack.

Some mechanic that allows you to capture a defeated monster as a figurine (inspired by SpliceHack’s cartomancer but not tied to a specific role, and also not as easy to come by, probably requiring special magic or a special tool to perform it).

When a monster triggers a magic (or maybe polymorph) trap, one possible effect is that they turn into a figurine of themselves with appropriate beatitude. However, the trap exploding on them is more likely, so that it can’t be used to farm figurines. A possibly evil addendum is that if the player would have otherwise died from damage from a magic trap, the bones file may contain a figurine of them instead of a corpse.

Statues of a monster occasionally contain a figurine of that monster inside.

Artifact figurine Doppeldoll: when applied turns into a tame clone of yourself with copies of all your weapons and armor.

Figurines cost 50 times their monster’s base level (or some other constant).

Figurine monsters generate with an inflated monster generation difficulty (because a figurine of most at-difficulty monsters is likely to be underwhelming as a potential pet).

Blessed figurines always make the monster turn out tame. Uncursed ones make a tame monster 80% of the time and peaceful 20% of the time. Cursed ones make a tame monster 20% of the time and a hostile monster 80% of the time.