Since Henri outright confirmed that he was the one who made the page for Pippa, this leaves us an interesting rabbit hole regarding him that we can go down.
The account that added all of the stuff on Pippa was named "memememememe". (Side note: it was not him who started the page for Phase Connect - that would be somebody named "GalaxyEdge777" who seemed to be obsessed with Remi. That would be a rabbit hole for another day.)
In any case, this gives us a solid account to look at the history of. If we look at that account's edit history...
We can see his use of TVTropes goes as far back as
2011. This gives us a decent roadmap of his interests.
Unfortunately, this edit history is only available for people with accounts on the site, and frankly I'm unsure how to archive pages like that unless it's done manually with screenshots. Either way, I'd probably rather not archive
every single page of edits considering he has
70 pages worth of them spanning a solid 11 years. Therefore, I'll give the highlights:
As you can see above and immediately below, he seemed to have a bit of an obsession with Hitler and dictators in general, as well as an obsession with Nietzsche. His weird pseudointellectualism seems to have be built upon solid ground.
Some other, less important highlights from other pages include obessions with religion, especially them being ebul (*tips*), an obsession with Madoka, an obsession with eldritch horror/Lovecraft, obsessions with anime and manga, and, of course, Hololive.
A frequent page he edited was something called "Poison Oak Epileptic Trees", which are, as quoted from the page, "a crazy theory of your favourite[sic] show/game/movie/book/etc., that just pops into your head, but you
don't want to be true." In other words, schizo theories that he formulated in spite of not wanting them. Points pretty heavily towards him potentially being paranoid schizophrenic. He also edited "Wild Mass Guessing" (theorycrafting) pages for Real Life, Joseph Stalin, the Bible, Neon Genesis Evangelion, and Adolf Hitler. Quite interesting.
I'll see if I can do a more complete archive later - right now it's very late at night and I need to sleep. Just figured this should be out there for other people to check out - if you use TVTropes or have an account you haven't used in a while but can still log into, feel free to take a look and add to this. It's a rather important step in the path of understanding his use of the internet before Phase Connect.