Favourite book characters?

Out of all the books you have read, what character has stood out to you the most and is therefore your favourite? What do you like about them?
For me, and I am sure others relate, I have many favourites, off the top of my head:
Percy - Percy Jackson and the Olympians
Kaz - Six of Crows
Leo - Heroes of Olympus
Elizabeth - Pride and Prejudice
Citra - Scythe

While not strictly speaking from a "book" in the modern sense of a physical book, Karṇa from the Mahābhārata is a pretty fascinating character. We only read a handful of passages relating to him when I was studying Sanskrit, but he's a sort of uniquely tragic-hero character in a literary tradition where that character archetype was (I gather) not very common.