Celeste is very similar to 
Mina as she is a hyper-mobile mage that specializes in large forms of burst damage and sustain. As Mina has verticality and invulnerability through her 
Sanguine Retreat, Celeste gains large forms of air control and a lower gravity instead. The goals of both characters are vastly similar however, as they both want to take over the map and lane with high mobility and high damage.
From the official Steam page:
"It's not every day that Coney Island's biggest star, The Dazzling Celeste, performs on the streets of Manhattan. Her show begins with Light Eater, where a deep breath lit by her blazing baton coats enemies in front of her, and grants increased damage against them. Following that up, she envelops herself in the prismatic shield of her Dazzling Trick, which explodes and silences nearby enemies who break it. Try not to get distracted by her gliding gracefully through the air, or by the dance of her Radiant Daggers, as you'll regret being underneath them when they rain down from above. As for her memorable final act, the Shining Wonder will make her allies go OOH and her foes go AGGHHH! - "You are about to see something rare and wonderful!"
Lore
Even in a world of magic, some things are still rare and unusual. So what is a unicorn to do? Announce her presence to the world and potentially have poachers looking to saw off her horn? Or hide in plain sight at a Coney Island Side Show where most folk would assume her appearance was just part of an act?
Over the years "The Dazzling Celeste" has grown into one of the more popular attractions on Coney, and while the applause from a cheering audience is appreciated; what keeps her waking up in the morning is the found family she's made at work.
Keruba the Mermaid.
Blockhead Lenny.
Chickenwing.
Ted.
These were her people. So when she discovered that one of her own sold part of their soul in order to cover a gambling debt, Celeste knew it was time to step out of the shadows and do whatever it takes to get it back. Is revealing her power to The Patrons a risk? Yes. But that's tomorrow's problem... her family needs help today.
