"A bigger version of the sword Hugo uses but scaled for a bot." 

Unless there is something special about this sword, it is inferior to even a rookie Shisso in melee capabilities. Just a heads up. Is it an EDB or specially shielded?

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"4x Point defense systems"

That work... How? More detail please. In a setting with multiple types of point defenses, specification is necessary.

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"Generic rifle"

Just so we are both on the same page, this means it is a ballistic weapon.

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"ATA-series armor"

There is constant mention of a ATA-series armor, but other than being waterproof, I know nothing about it. Is it just so nondescript as to not be worth our time?

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"the weapon, while terrifyingly effective, would kill off most of the civilian population as well."

The U.N. has never gotten even vaguely close to having designed such a system once, much less multiple times. The U.N. is generally a step behind in the tech race.

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"and the only person alive who was actually born there, before it became a shard"

As old as he is, he is not that old. We apologize for not establishing that the merging was 150 years ago.

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"capable of receiving wireless signals from other Kensai belonging to the Thunderchild, namely those which operate the Sonic Disruptor, and can amplify the sound over ten fold."

So, if I understand it correct, the Fake Monk is equipped with a system that receives the sound based attacks from the other Kensai and then projects it out multiplied.

If this system existed, it would make far more sense to simply design all your speaker systems with this multiplication effect already installed.

Also, in the natural progression that will happen eventually, if someone lines up two Powered Speakers systems from the Fake Monk, suddenly you have exponential attack power growth.

Exponentially growing power is a bad thing. Powered Speakers, if I understand it correctly, is denied. You are welcome to use the same normal designs as the other mechs, however.

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General Notices-
Unless I missed them, none of your Kensai have any noted weaknesses in their armor, unlike every other Kensai in existence. This is ok, but means that your average case performance will be slightly worse due to having no lower end to balance it out.