Song of Spring 3rd lv.

As an action you can perform a tune that lasts for one minute, & friendly creatures within 30ft gain temporary hit points equal to twice your proficiency bonus.
Additionally, you may use your bonus action on subsequent turns to bestow temporary hit points to friendly creatures within 30ft of you.
You can use this feature a number of times equal to your proficiency bonus, and regain all uses after completing a long rest.

Whimsy's Weaver 3rd lv.

Whenever a creature succeeds a saving throw against an Enchantment or Illusion spell you cast, you can expend one of your Bardic Inspiration die, roll the die, & subtract the total from the result; potentially turning the success into a failure.
Alternatively when a creature you can see within 30ft fails a saving throw against an Enchant or Illusion spell, you can expend one of your Bardic Inspiration die, roll the die, & add the total to the result; potentially turning the failure into a success.

Fey Enchantment 6th lv.

When a creature becomes affected by an enchantment or illusion spell you cast, you may expend one use of your bardic inspiration die. If you do, choose one of the following options:

• You show them fey beauty. They become charmed by you for the duration of the spell if they aren't already. Furthermore, they become charmed by one creature of your choice within 60 feet of you, as you paint them in a new light.
• The target has disadvantage on all subsequent saves they make to resist the spell.
• The target's speed drops to 0 for one round.
  Furthermore, the round after their speed is reduced by the feature, they become frightened on the following round by one creature of your choice within 60 feet of you.

Changeling Courtier 14th lv.

When you bestow a creature a bardic inspiration die, instead of rolling the die, the target may expend the die & choose one of the following effects.

• The creature has advantage on the next attack roll it makes.
• The creature adds +1 to the DC of the next spell it casts.
• The creature turns invisible until the start of it's next turn.