Also, if this works, then... "Too, is this sentence right?"

I've never seen anyone use it, not once in my life, even from the worst writer.

I'd bet money that it is not an acceptable way of writing. Or talking.

I've heard older (like my grand and great-grand parents' age) people *say* that when their grammar goes up on stilts, but I have never, ever, ever seen it written.

Too, I never want to.

I've seen it in a published novel by a respected author. It stood out because I'm not used to it, but it didn't grate on my nerves.

I've not seen it either, but then there's a lot I haven't seen. It does seem archaic usage and would jolt me from a text. Could be it's being used to reflect the time period/generation, in which case it would be okay(ish), but... hmmm, it sounds like an author footprint if it's across multiple texts. Again nothing wrong with that, but sometimes a comprise is needed for a more natural flow that doesn't take the reader out of the work over word choice. But that's like telling my son to stop 'Basically' at the start of most sentences, lol. We all have our kinks and quirks over language.

I've seen it following a corresponding sentence. John O’Brien’s Leaving Las Vegas--

Common wisdom would indicate that she should be a little apprehensive but her instincts tell her differently; this person wishes her no harm. Too, she hasn’t felt inclined toward apprehension lately. She has quickly faded into an observational fatalism — or is it bland apathy? She doesn’t really care.

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If it is suppose to purposely annoy the reader or go What the .. I'd say it does a pretty good job.

P.S. note the use of purposely

I know someone who says, "And, too, ... " to emphasise what they're about to say. And another person who says, "Plus as well, ..." Neither exactly help my blood pressure. I wouldn't use either, nor would I use "too" in the way quoted in the OP. But I'm not sure it's wrong. I've read it in a few places.

Creep said:

I have a friend, this maniac, who writes like this all the time. Example :

"Too, the meaning of a word or phrase is not limited to its original or most popular meaning."

This "too" drives me mental. I know you can say things like:

"Also, I write pretentious sentences."

But her "too"?

It's going to make me smash something. I hope somebody can tell me it's wrong, but I suspect it's probably allowed. Too, some people might even like it. But it makes my eyes rattle.

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Does she start the preceding sentence with "Won"? It could be simple spelling error

I frequently hear (and have used in casual speech myself) "Then too, ...etc." I think starting with "Too,..." is just a shorter version of that. At any rate, I see it as a colloquialism, and there's nothing actually wrong with using it in dialogue.