Board Thread:Fun and Games/@comment-32193766-20170603214506/@comment-30438304-20170702104625

He was originally a boss monster. But the key word is " originally". Now he is just SOULless, so a regular monster SOUL would be enough to make him have feelings.

The LOVE doesn't remain with him. If he resets the timeline he'll just be back to LOVE 1( or back to LOVE x if he continues on a SAVE.) - based on what happens to Frisk, this is the most likely option( I mean, he - Flowey, has gone back into the past. No one except him will remember what happened, and the LOVE will go down.). If he truly had all that LOVE, he would be at LOVE 20 or LOVE *insert large number here*. It wouldn't matter that he has all those SOULs, since he would still be empty. Frisk has a SOUL, but they're still able to kill everyone in the Underground because of the high amounts of LOVE, without remorse.

Human SOULs don't inherently contain love or compassion, but humans( Frisk being our only example as of the time of writing) in UNDERTALE can still feel love and compassion. I believe that the human SOULs had no effect on him emotionally is because he is a monster.

This isn't really a theory, because we know that if monsters have monster SOULs, they can feel (emotions). Though, some parts of the theory - the LOVE part - isn't possible in the cannon as as far as we know.

He wouldn't be able to absorb a boss monster SOUL - without issues, that is. The SOUL would be damaged at least somewhat when absorbed, and we do not know what effects that has.