The Sweetest fiend (revised)

A kind smile and a glittering exterior, both speak to the kindness of your character, and mask the menace behind it. 

• Whenever you give bardic inspiration to a creature within 5 feet of you, you can also offer them a piece of candy, if they accept, when they roll your bardic inspiration die they may roll twice and use the higher roll. 
• Whenever an ally, who can hear you, attempts a Charisma check and rolls a Nat 1 or 2, as a reaction you verbally assist them (you must RP what you say). If you do so, they may reroll the check but must use the new role.
• You can subsist on sweets for an extended period of time. you can go up to 3 days subsisting on only a handful of candy per day before incurring any negative effects. 
• Lastly, whenever you roll an acrobatics or stealth check, you may spend one of your bardic inspiration dice to make a performance check instead (you must use the new roll), salvaging what might have been a failure with a dazzling display.

you gain this ability at level 11: 

Traumatic conclusion:

once per long rest, when you land an attack on a Creature with a sneak attack, you can ravage their mind with horrible psychic visions. You can roll any number of bardic inspirations dice you have and add them as additional psychic damage to this attack. 

If this attack reduces the creature to 0 hit points, they die instantly, and in their dying breath you control the last waking moments of their mind. You determine what they see either as a perceived illusion or as an internal monologue indistinguishable from their own thoughts. You also regain 1 bardic inspiration die. 

However, should this attack fail to reduce the creature to 0 hit points, they realize the illusions are not real and immediately become aware of your immediate presence and location. Furthermore, you are stunned until the end of your next turn, as you suffer psychic recoil from this ability failing.