"Boy, that sounded stupid when I said it out loud!"
In Drowtales, maybe 1/3 of the cast is either the daughter, granddaughter, adopted daughter, etc., of an Ilharess; plus there is Vaelia, advertised as "An Emberi Princess", and "Queen Liriel Blueberry the Third". Partial aversion as well: only a handful (if that) have personalities that fit this trope.
The first arc of I Was Kidnapped by Lesbian Pirates from Outer Space is an attempt by the crew to find their long, lost Lesbian Princess. Which they do — it's just not the person they expect. The second arc appears to be about returning the princess to her mother.
Tower of God: You are facing a giant carnivorous eel in an environment that's thicker than water? Yuri Zahard is here to dynamically enter on your face and give you an ultimate sword. You best friend is dying of blood loss, but the exam won't be stopped because of something as trivial as that? Androssi Zahard is here to kick the examiners ass (a legitimate way of making your team pass the exam)! The team's power houses are about to be humiliated and killed? Enter Yuri Zahard with her Glowing Eyes of Doom. Yes, Zahard's Princesses kick ass.
In No Rest for the Wicked, November really is a princess (specifically, the princess from The Princess and the Pea); unfortunately, no-one believes her, because traveling through the woods on her quest has made her look too ragged. (She can tell who really has royal blood and who doesn't, but that doesn't seem to be a common ability.) She subverts this trope at times and also plays it straight.
Feferi Peixes is never referred to explicitly as a princess in the comic, but considering that she's next in line to become empress of the galaxy-spanning Alternian Empire, wears a tiara at all times and lives in a giant undersea palace, she belongs on this list.
In addition to this, every player of SBURB is a prince or a princess of Derse or Prospit, the kingdoms of light and darkness warring in the game. That makes Feferi, accordingly a princess of Derse, a double princess.
The Erlking's Daughter (yes, this is her actual title, her name is Aisling) in Roommates is a literal fairy princess, who is quite badass and magical... and uses her powers mostly for the noble cause of shipping the cast.
In Brutus, not only is Mirabelle a princess "studying undercover" at the school, her friend Narcissa is as well.
In Suihira, we have princesses Wahida and Hadima of Iona.
Bound Adventures: The kingdom of Boundaria is currently ruled by Princess Irina.