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An idea for the Mutant Mashup Au made my @possumsarenice and I.
Niccolo and Purple actually used to be close as kids. They naturally had lots of similarities and spent most of their time together building things. Whether it was a joint project or helping each other build inventions as each other's lab assistant, both purple turtles enjoyed each other's company a lot in those moments.
However, the more advanced their tech got, the farther away they would drift. Purple eventually started thinking that Niccolo was trying to outshine him, meanwhile Niccolo just wanted to build things just as amazing as his cousin. It's because of this insecurity that led Purple to bond more with Sanzio.
It's important to note that Niccolo never wanted to outshine his cousin and only wanted to be seen as an equal to him. He misses Purple and the things they used to build together, misses having someone that could understand him in a way the rest of his family just can't. Sometimes, Niccolo wishes he wasn't that smart and could be more laid back like Simoni or Blue.
This all comes to light when the purple turtles are captured by Big Mama and the 2012 Purple Dragons. Both boys are locked in a room and are forced to work together to get out before time runs out but things are not going well. Purple is trying to do everything himself and refusing help, but Niccolo wants to help him so both can escape. It takes a good while of arguing but Purple spills the beans about what he thinks about his cousin, how he thinks Niccolo is trying to replace him. Niccolo is speechless for a second before admitting how much he wanted someone, anyone, to stick around whenever he wanted to build machines. He felt like Purple abandoned him for bigger and better things, leaving Niccolo behind.
The two eventually clear it all up and start to reconnect by doing more joint projects like old times. Both still work on separate projects, but they have fun when they work together like they used to.
Alternate idea is that they still drift away from each other but neither notice until it's pointed out. I'll put more thought into that later but yeah.