Sophie also noted his 'rather impressive amount of muscle tone.' It is also stated that he has very long and dark eyelashes.

As of Nightfall, a scar under his ribs from the Ogre king, Dimitar's attack. He has to have broad shoulders and a lean frame. His father is the complete opposite of him, and always wants him to present himself neatly. So many, in fact, that when they are looking through his bedroom in Lodestar, Tam says, 'Dude - this guy uses more hair products than I do!' When wearing his Foxfire uniform, it is said to be a little messy, his shirt is untucked and his sleeves are rolled up to about the elbows. He is very meticulous with his hair and is known to have more than just a few Elvin hair products. Keefe is tall with messy, artfully, and carefully disheveled blonde hair and ice blue eyes with flecks of dark blue.

Keefe has a crush on Sophie and as of Book 9: Stellarlune she has confirmed to return his feelings and the two are currently in an in-between stage of friends and more-than-friends. This may show that either he doesn't like his middle name, he's embarrassed about it, or it reminds him too much of painful memories. His middle name on his registry pendant record is redacted, although he dubs it 'I'm-not-your-legacy-boy'. For example, in Gaelic, the name translates as 'male descendant' or 'related by blood', often used for the oldest child in a family. Some interpret the name Keefe as meaning noble, gentle, handsome, and cherished, although there are many meanings for this name throughout different cultures. In Exile, he admits to Sophie that he often hides behind his jokes and teasing and he uses them to pretend everything is okay, although deep down it's not making jokes and teasing people are his coping mechanisms. Keefe still shows how his mother didn't say anything when Lord Cassius abused Keefe. His mother, however, has shown fake kindness to him multiple times in the books. He has family issues (even claiming the role of troublemaker with Daddy Issues, also being grumpy about Tam Song's claim to the title as well), as his father was both verbally and emotionally abusive, while his mother, a member of the Neverseen before Keefe was even born, treats him as a pawn in her overarching plan after lying to him for years. He is best friends with Fitz Vacker and has shown that he's always wished he was a Vacker - to the point of him seeing the Vackers as his family, and as such spends a lot of time with them.

Keefe is the only child of Lord Cassius Sencen and Lady Gisela Minette Sencen, who is a part of the Neverseen. He joined the Neverseen as a double agent in an attempt to infiltrate it and tear it down from the inside, as well as to sneak information to the Black Swan. He is a member of the Black Swan and a former member of the Neverseen. Keefe Sencen (pronounced Keef Sense-in) is a main character in most of the Keeper of the Lost Cities series.

Keeper of the lost cities