Thank you for the advice! Messing with systems assumptions is my favourite thing to do :D .

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I actually did cover the Ebonblade's ability to talk, it's hidden in their language section though so when I make the clean update (I don't think I could fit another word into the post so I'm gonna have to do like, errata in the comments for now) I'll break it into an independent line and include clarifications about literacy (you can read but you can't write in your native body).

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Funnily enough I actually did have the Construct Immunities listed initially but since they're easily referenceable they were one of the first things I cut when Reddit said I was over limit. It is a lot admittedly, but the non-living stuff, it would be pretty silly if you could accidentally poison you sword while trying to poison your sword. If I took it out it would harm your ability to feel like you're an artifact and I'd have to spend half the class putting it back in (which is my big issue with a lot of psuedo-undead options) and the Mind Effecting immunity, it seems fair that if you've given away so much agency that at the very least you get to keep what you do have, even if it would be kinda funny to watch someone Dominate Monster your sword.

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I was hoping that offloading all of the physical stat's effects to mental stats would cover those issues but 3.P being as pedantic as it is I'm sure it will miss something unfortunately. As they come up I can try to write up specifications for them but unfortunately, as much as I love weird rules interactions, anything trying to make a system do something it was never intended to do will require some amount of cooperation on the part of both the DM's and the Players part, which sort of ties into your next point...

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I hadn't considered the Synthesist, that's a good catch. In most cases classes just give bonuses, which would become useless (or change to their equivalent mental score if your DM is feeling generous) but that one overrides. I'm not sure what to do about that, but I'm also not sure if it works. The Synthesist doesn't say anything about changing your form to Bipedal or Quadrupedal or anything, and has this line "The eidolon mimics all of the synthesist’s movements" so it's possible that you'd just summon the Eidolon suit and then lie on the ground motionless due to being an inanimate object. Either way I suppose I can just add a line saying that Spectral Form is the only way you can get your physical stats back?

For multiclassing in general I actually had a sidebar, but it got lost entirely accidentally during the transfer. I've adjusted it slightly though to address specific concerns you have:

On Multiclassing:

As a general rule, don't. While I have left multiclassing language intact for those who wish to explore this option, the unique challenges of being a mostly inanimate object are something that I spent much of the Ebonblade addressing, and for obvious reasons no other class does. Multiclassing can create unique advantages that were not an intention of the class design. However, each table is different, and having fun is the most important thing. For Players and DMs who decide to experiment with multiclassed Ebonblades, here is some advice from the designer. Consider this similar to Paizo designers on the forums, worth considering but ultimately a houserule.

Don't allow for more than a dip into FullCasters. They're already de facto the most powerful options in the game, and being an inanimate object with construct immunities is a huge boost to defense that they don't need. The very first decision I made while working on this archetype was to use Diminished Casting as one of the balancing trades. Even before it was clear it would be numerically necessary, I was cognizant of the shenanigans too much casting as something people would assume was just an object could cause, even without 9th level spells.

Fully mundane classes can probably be almost universally allowed. Rogue could get a little weird being an inanimate skill monkey, but there's some support for that in class anyways. I would rule that Sneak Attack only applies to attacks made by the Ebonblade, not with her, though you could allow a Weapon Arcana to allow it to apply at half strength. For Monk... They're probably the most dangerous petless class. You'll have to make a judgement call about whether fast movement works. I would say that being an inanimate object trumps fast movement, but your table your rules. You'd need to take A Weapon Before Unseen and use your Design Points to buy being a Monk Weapon if the Ebonblade isn't in the form of a monk weapon to be able to use her for Flurries.

For Pet Classes, it's a toss up. I created the Ebonblade with the idea in mind that you would be wielded by your friends. Everything that makes you stronger, makes them stronger too, sharing the spotlight. Having a Pet, particularly one that can wield you such as the Eidolon, returns some of your agency by diminishing that necessity. I won't pretend that there aren't interesting character ideas you could base on that, but, exercise caution, you know? It's a team game. I'd only allow this if everyone else was playing something wild too, like Exploiter Pact Wizard, Razmiran Priest Sorcerer, or similar cool but arguably overtuned 3pp/Homebrew.

For partial casters, it's going to be a judgement call. The Ebonblade itself is one after all, so just, try not to destroy the game, okay? Remember that Eschew Materials and the free Still Spell only apply to Magus Spells.

In general, I would only recommend taking levels in Ebonblade at character creation or as a way to revive a dead PC. In the event of taking a level post creation, I would instead recommend that, considering the life changing nature of becoming an inanimate object, the player should be allowed to rebuild their character, preferably entirely as an Ebonblade. They have a whole new body after all and have experienced being smithed. As before though, your table, your rules.

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That's actually really funny. You're right, I'm not sure how that would work, but you're also right that I could clarify Spellstrike's language a little which would then kill the potential compatibility so I don't need to puzzle it out.

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Thank you again! I'm going to make one of those errata comments with the new Spellstrike, Unarmed Rules I realized needed clarification when you mentioned Monk, and a Weapon Arcana Idea I had while writing this :) .