He really is. I just want to punch him in the face and call it a day. Persona's villians just tend to be loons. At least Nyx couldn't help her damn self and is just responding to humanity's despair and longing for death. Adachi was just a waste of space.
I'd say that Adachi's seemingly simplicity, the fact that he's no criminal mastermind, but just a broken man who was granted incredible power is what makes him interesting but incredibly dangerous as a villain. His state of being refers to the psychological term, deviced by Kierkegård called "ressentiment" referenced several times in that same game. It involves a sense of hostility, which is directed at the source of the the individual's frustration, that is, an assignment of blame for one's frustration. The feeling of weakness of being inferior and jealous in the face of that same 'cause' triggers a self-developed moral compass, which blocks out the perceived source of frustration. Think of it as a scapegoat, which the ego manifests to insulate itself from any culpability, perpetrated by the individual (no matter how immoral).
It refers to Adachi's monologue on "talent only mattering" in the world he wanted to wipe away and it is there where it becomes relevant.
In the light of this - Adachi was the player's true 'shadow' a void of a man that acts without conscience or reason. Where the player's talent uplifts those around him, Adachi uses his power to do whatever he likes, just as he became a policeman for want of a gun license and A power trip. It's even implied that his assignment to Inaba was an act of punishment for some unrevealed sin, further emphasizing that he was a total dick.
Though he earns a shred of redemption via his "true ending" letter, he is pathetic beyond pity.
This is what makes him compelling though. An example of what humanity can become when they've given up hope.
But anyway, disregarding him -- The reason I brought him up was simply because I love him as a villain but can't really see him as a layout for a LI.
The reference was more in line with how I'd like to see these 'so-called' darker characters, if you will, written with that same amount of care and finesse on par with say Obsidian's characters.
Heck, I'd love more characters like Steven Heck, Atton, Bao-Dur, Mira and even Canderous.
It's safe to say that my interest is still directed towards a character like Atton who subverts the usual Han-Solo tropes in light of something much deeper and disturbing, once he actually relates his backstory to you and pretty much says that he didn't ever regret anything he did during those days.