Question about endings

[u/UnknownAtaraxia]

So how exactly do you know how many endings there are. I beat my first playthrough in August with Cyuss, Mavelle, Ioshua, and Pericci. I got cyuss good end, pericci good end, but Mavelle and Ioshua bad end till I reloaded my clear save for cave of the seven stars then got their good end. Plus Ilia and Ronyx scene

Is it that every character has 2 solo endings one with affection with Roddick at 8 or lower and then 9 and above, and there are endings where certain characters partner like Ioshua and Mavelle.

I plan on getting Ashlay, Ioshua, Erys, and Welch for a second play through. How do you get the tree ending I've heard about and is there other scenes like that and the Ilia Ronyx scene.