I can't answer the entirety of your question. He of course was a huge influence both at the time of the revolution and then later as a symbolic figure of that revolution. In Vodou, he has become deified and people I have spoken to during fieldwork will reference him as part of the reason they are so proud of their nation. He has been folded into larger religious narratives and is called the son of Agaou Ginou and some even argue his father was a king in Africa (though there is no historical evidence for that.)

Now the image of Toussaint is really interesting because we periodically see him depicted in ways ranging from light to dark skinned. Sometimes he has facial markers indicating his African descent and sometimes he looks French. He has become a symbol and as a symbol he gets reinterpreted depending on who is presenting him and the audience. Plus, we honestly don't know what he really looked like so it is up to the artist. For example, check out this contemporary folk art depiction by Séneque Obin and compare it to his image on Haitian currency. Or this Haitian folkartist Gerard's depiction here to this historical European produced engraving.

In Haiti, he is almost always dark skinned enough to link to his history as a former slave. But sometimes his knowledge status is marked by Frenchness, which in Haiti today marks class which is linked to education. We also see Europeans alternately depicting him as almost a stereotype of African appearances to very French just with dark skin. This likely plays into the ways he was discussed in Europe at the time. Either he represented the "barbarians" or the only way to explain how he could eloquently argue for freedom and beat Napoleon's armies was to cast him as more European. Now I haven't read anything about that specifically but I'm borrowing the idea from Trouillot's Silencing the Past where he argues that a slave revolt conceived of and enacted by the slaves was literally unthinkable to Europeans. If Trouillot is right, then a work around mentally could be to reimagine Toussaint as European and therefore capable of these things.