Ideas conveniently sorted into useful categories.

Abilities ideas:

An ability with a + shaped area.

Dealing random elemental damage to enemies.

Social ability : public sex reward (only usable on characters with proper sex traits).

Combat abilities should be usable with number keys.

Finally, single-character buff abilities should not use a turn. The shaman buffs are just worse than using multi-target buffs or simply attacking enemies. The best defense is the enemy being dead.

New dungeon encounters ideas:

Freeing slaves should give a small random reward (see later) instead of a chest every time.

An optional trapped side area with a small reward.

An optional strong enemy with a small reward.

Healing or feeding an NPC for a small reward.

Locked door leads to skipping to next dungeon level.

Small reward types:

Find a shrine.

Encounter a rare resource trader.

Peon from a rare race available to hire.

Gain buffs for this dungeon.

A friendly characters offers sexual or social rewards (with appropriate buffs).

Find additional resources to be gathered at the end of the dungeon.

Find the location of a rare, non-purchasable dungeon.

Find "stolen goods", which give faction points.

Find a temporary character, available for the current dungeon only - can fight, heal, pick locks and help gather resources.

A helped character promises to deliver an item later - get something valuable at the mansion some time later.

Find a convenient rest area, which gives additional healing and/or buffs if advancing time while in the dungeon.

A debuff for the final boss or its party members.

Get additional, high-quality characters available for hire at the guilds.

Find a nice spot that allows you to go on a one-time date.

Character(s) gain sex trait(s).

A character with enough experience, and fulfilled prerequisites can gain a class that you don't have unlocked, or that isn't normally available.

A character mutates. Most mutations would be cosmetic only (Body parts change size/color). Some might have purpose (grow wings, sex organs).

Characters gain obedience/authority/loyalty.

A new side quest that gives rewards only, no guild points.

Edit: Bug:

Asking Aire to marry causes errors.

Suggestions:

Stone-type materials should not be primary materials for armor. Stone armor makes no sense.

A mansion upgrade for the kitchen, allowing to cook vegetables into sugar, then sugar into sweets-type food. Rarely, characters will spawn with sweets as preferred type food.

Too many quests ask for very simple materials, and offer way more than their worth in rewards. This is especially silly when the reward is an item made of these same materials.