The DA was practicing patronuses, muggle-born Alex Potts and Sara Halburg were the best of friends. They grew up together and when they found out that they both were going to Hogwarts, they were ecstatic. And they were inseparable, they were both sorted into a Hufflepuff. Both of them are kind-hearted, pure smol beans. But one big thing about them is that they lived in the U.S. briefly and both fell in love with Transformers. They were Transfans since they were little since it came out when they were 3. They have all the Cybertronians memorized, both Autobots and Decepticons. Though they favor the Autobots and wear matching Autobot necklaces. When they were asked by the pureblood students, they just laugh and say that its a muggle-born thing.

"So what do you think your Patronus will be? I bet mine would be like a bunny, I love those furry little fluff balls" Alex muttered as Harry explained the basics and how they should focus on the happiest moment of their lives again.

"I think I will get like a cat, they are cute little suckers, vicious but cute," Sara said as she got ready to make take her turn. She and Alex have been practicing extra by coming to the Room of Requirement during breaks. Echoing cries of "Expecto Patronum!" rang through the Room as they tried to conjure up their patronuses. Sara took a deep breath as she dived deep into her mind, she tried to think up of a happy memory. The most prominent was finding out that Alex was also going to Hogwarts. They were ecstatic and squealed extremely loud and got odd looks from their neighbors but they didn't really care about that.

"Expecto Patronum!" A wispy vapor started to flow out before a silverly-white shape started to take shape. It wasn't small like she expected but it started to grow tall and towered over everyone. Sara took a good look at him before gasping out loud. She took a double-take.

"That-that- that's not possible! It can't be!'' Sara spluttered before looking at Alex, who just gaped at her. The entire Room had stopped and stared at the mammoth being in front of them. The purebloods and some sheltered half-bloods were confused as the muggle-borns started to laugh hysterically at the dumbfounded looks on their faces. Hermoine laughed with Harry as he came to congratulate her. He pats her on the back, smiling and said congrats.

"Jazz?!" Sara exclaimed, her mouth had dropped, and she was in shock. Her hand strayed to her neck. The small necklace felt cold and familiar. The mech was her favorite for most of her life, he was a badaft.

The giant Autobot had now slowly dissipated. If she got Jazz, that means Alex can have-, Sara looked at her friend expectantly, motioning with her hand like 'well, go on'. Alex looked at her for a second before yelling,

"Expecto Patronum!" A silvery wisp flowed out and it grew as Sara's did. It continued to grow, higher than hers and then it took the definite shape that had Alex gasping and crying out,

"Prowl?!" Alex was in shock before laughing hysterically she turned to Sara, and she hugged her. Harry had congratulated Alex on her Patronus and moved to help Hermoine explain Transformers to a poor confused Ron. Sara had started to laugh too and the Patronus had dissipated. They took out their necklaces, holding them gently and looked at their classmates. Their fellow muggle-born Hufflepuffs had laughed and the two found some other Transfans.

The purebloods were confused and kinda scared, two giant beings had sprung out of someone who you would expect to have kittens. The muggle-borns that watched the show had started to laugh too. The Room was filled with laughter and the purebloods will forever be terrified of the two seemingly harmless witches that have giants as their Patronuses, even though they have been told they were 'alien robots' from a 'show' whatever that means. 

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Wrote this on a whim and not one of my best works but still wanted to share it. Not sure if it's possible though to have a fictional character as a Patronus. But in this story it is. I might continue this, I don't know for sure. Stay happy and healthy.

Your fellow fandom member