What is the best way to fake a topdown 2D game in a 3D world using only sprites for characters and level designs ?

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:bust_in_silhouette: Asked By NewBro00

I want to know how to make a proper 2.5D game prototype like Cross Code and think about faking 2D with 3D. But for that, I need to know how I could arrange sprites such that I can move on platforms with different heights, with their height measured in pixels or rather voxels since it’s in 3D space.
Camera has to be rotated 45 ° from the horizon to display an orthogonal/axonometric top down view.
What are the different elements I can use to setup a project as such ?
I already have the sprites…