[quote=@Necroes]
<Snipped quote by Guardian Angel Haruki>

For what it's worth; After looking it over, the subclass seems balanced. Underpowered, if anything, by modern D&D subclass standards.
The guardian-variant companion is pretty tanky and makes for a good shield, but using it to shield squishier party members limits its damage output. The offensive variant is slightly more damage than using a BA for an off hand attack, but apart from the land bound form basically making itself a flanking companion without asking, it's not especially potent.

The rest of the class is just niche utility that could be covered by a Find Familiar spell.
[/quote]

Except unless you pick a chainlock, you're pretty restricted as to what you can do with your familiar. For example, your familiar cant attack. This gives some of that familiar abilities like possession,but the biggest perk is that it grows with you. Your familiar will always be the same weak raven or imp. This scales up with levels, much like the Drakewarden's Drake, or Battle Smith's Steel Defender.