JUSTICE FOR ALL!
Virizion: The Legendary Trio that Virizion belongs to is formally known as The Swords of Justice, which in itself makes this description pretty self-explanatory. I chose Virizion over the other two due to its more feminine appearance and its Grass typing, which means it could very well use bamboo blades in some of its attacks.
Yamask: Aside from being sad, lonely and unable to feel joy like Peko, Yamask also reflects her brilliantly quick-witted plan of masquerading as Sparkling Justice by wearing a mask and talking like a nut.
Bisharp: I was really struggling over whether to use Bisharp or its equally-pointy pre-evolution Pawniard, as the former gives off the same sort of cool and reserved air as Peko but the latter better represented her position as a "pawn" or a tool. I ultimately decided to go with Bisharp because its Japanese name actually includes a few of the same characters as
Kira Kira-chan (the Japanese name of the serial killer Peko pretended to be), which is too funny a coincidence to pass up.
Samurott: Believe it or not, the pointy beige objects protruding from Samurott's leg armor are actually full-length swords, which makes the connection pretty obvious by itself. However, I also chose it to represent Peko because of its association with water as well as its fiercely loyal nature (the anime states that it has a tendency to charge into battle without its trainer's permission, similar to how Peko murdered Mahiru without waiting for the order from Fuyuhiko).
Megallade: I'll be entirely honest with you here folks, I only chose Mega Gallade because of its sword arms and ridiculously cool design. But I mean c'mon, look at it! Tell me that Peko wouldn't want to train one of these bad boys the moment she laid eyes upon it. It can also learn Leaf Blade, which involves slashing with a wooden or leaven blade, for what it's worth.
That's all for today, folks! Once again, tomorrow's subject will be determined by the first person to post some sick-nasty subject of Ms. Pekoyama!