That is a hard one. I would choose Minerva Charm first oddly enough. I had a sim of mine who was a kid that lost her dad and was taken in by Minerva Charm. Mineva was an excellent mom to my sim child and when she aged up to a teen Minerva had no problem agreeing to teach her magic. Minerva is warm and caring but you mess with her she'll make you pay. When my teen sim ended up pregnant Minerva seemed more disappointed with the young lady rather than angry. She helped with the baby and was always so very wise and endearing.
I love The Sages but I would want to have all three at once to lunch. Letting L choose where to go. I would give Simeon some obscure books of magic and ask him about the Golden Dawn. He may be a Sage of Practical Magic but I think he was few robes in his closet dedicated to rituals of The Golden Dawn. Don't quote me on that Next, I would be debating Left Handed Path sects with Morgyn since of the 3 of them he is the most dangerous. He stikes as Dark Pagan and we could share book lists with each other Lastly, L would choose where to go for lunch and I would want her ordering everyone's meal they will eat. She's a foodie and her tastes I believe would be impeccable She is more fun from my experience than mean seems to be a bit of an imp and mischievous.
Lastly would be the vampires. Caleb is so cute and brooding my sims have dated him in the past he is so sweet gentle and kind. When he loses it, it makes him even cuter. Lilith is strong and it would be fun to talk about art with her and Vlad I could have a conversation about obscure underground bands.