I don't own Tasha's. Is it relevant to Dandin's revamp at all?
Let's see... Level 5 Halfling Bard? Or you mean if you rebuild him?
For the Bard you get:
These Spells are added to your Spell List:
1st Level - Color spray; Command
2nd Level - Aid; Enlarge/reduce; Mirror image
3rd Level - Intellect fortress (NEW!); Mass healing word; Slow
-
Intellect Fortress (Abjuration) - Action: For 1 hour (concentration), you or one willing creature you can see within 30 feet has resistance to psychic damage, as well as advantage on Intelligence, Wisdom, and Charisma saving throws.
Higher Levels When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature for each slot level above 3rd. The creatures must be within 30 feet of each other when you target them.
(Though it occurs to me that you won't have any 3rd level spells, so that would be just if you chose to go Bard 5)
...Either way, you get for a level 2 Bard:
Magical Inspiration If a creature has a Bardic Inspiration die from you and casts a spell that restores hit points or deals damage, the creature can roll that die and choose a target affected by the spell. Add the number rolled as a bonus to the hit points regained or the damage dealt. The Bardic Inspiration die is then lost.
I'll look into Pet-related stuff and get back to you.