The Sylvari look humanoid because they have copied the look of humans right? Well, why aren't there Charr Sylvari or Asura Sylvari? They can grow a mushroom on their head, be born without a nose or look like their face is made of bark, so why can't they be super short like the Asura, As tall as a tree like the norn, or look more animalistic like the charr? Surely a Mini-Mushroom Asura-based or a Treebeard-esk Norn-based would be neat to see. Not to mention the monstrosity known as Charr-Sylvari.
And while I understand the amount of work this would take for PCs, I'm also refering to NPCs. Two trees are already in cannon, so why can't there be a tree that landed near an Asura settlement or nearly burnt tree near the firey wastelands or Icy wilds which create Asura, Charr, and Norn Sylvari NPCs?