These are the characters in Axetale.
Aliza is Frisk's daughter, born on the surface and forced to be raised by her grandmother after Frisk's death. Like her great grandmother before her (Aliza the first) she is kind and adventurous, with an iron force of will.
The red butter fly
A guiding spirit, physical light, and conscience to Aliza, along with the only form the spirit of Frisk can take while Aliza shows her Mercy to her foes. Not visible to the physical eye, only able to be glimpsed in peripheral. Gains energy and size with Mercy.
Frisk’s death was long, slow and painful. After her ejection from the Underground, sent on a mission to retrieve more human souls and to ensure her safety, she was brutally beaten and raped in an alley while searching for aid, and admitted to a mental facility when she insisted that she needed to return to helping the monsters living under the cursed mountain.
The white butter flies
Visible proof of Frisk’s growing spiritual power, grow more numerous with every good decision Aliza makes
Chara is the spirit of the first human child to die in the Underground, turned malevolent and hateful by the evil and murder in the Underground. Their power grows the more death is dealt, and has become almost as corporeal as Napstablook in appearance.
The scarlet moth
Chara’s physical manifestation when they take control of a monster or human being. Glows brighter and seems to drip blood the more bad decisions and violence their host commits.
Flowey escaped the Capitol after wreaking havoc and disappeared into the tunnels of the Underground. He is a master at hiding, even his enormous, grotesque body; the only way to know he is near is the sense of dread and darkness that hangs in the air around him.
Toriel was the first victim of Flowey’s rampage, murdered with extreme prejudice while on the way to the kitchen to have some tea. Her soul was used by Sans to eject Frisk from the Underground, and her dust was left abandoned where she fell.
Napstablook is, surprisingly, one of the least insane monsters in the Underground. He spends a great deal of time alone, which he did before anyway, and had long before the Hunger come to terms with his isolation. Thus, his wanderings and empty, ghastly whispers to the walls of the more and more empty caves do little to his twisted mind.
The dog guard
Of all the members of the Snowdin Dog Guard, only three remain.
Doggo, now completely blind (his eyes were torn out during an altercation with a lesser monster, suspected to be a Snowdrake), wanders the northwest sector of the Snowdin wood, hunting with scent and sound alone. He is a fearsome opponent, despite his handicap, and will not lose a trail once he has scented it.
Dogaressa now lives alone, after she consumed her mate, to keep him with her always. Carries twin, cracked axes, and speaks as though Dogamy is beside her, with the royal we.
Greater Dog has become a master of stealth, stalking prey from under the cover of the snow. His armor is a ruin of rust and twigs and ice, and can no longer close his mouth due to the overgrowth of his fangs. Leaves bloody pawprints in the snow constantly, and has decorated his small, blood stained home with the skulls of Lesser Dogs.
(unknown) God has abandoned this world. Annoying Dog hasn’t been seen since the Glitch ripped open the fabric of the world. It is suspected that he was consumed, went into deep hiding, or left the world entirely.
(deceased) Grillby is long dead. The Hunger got to him shortly after he left Snowdin, in an attempt to spend his last days with his family, and after killing and eating his own daughter, threw himself into the Dead Swamp, killing himself.
Sans, even demented and twisted almost beyond recognition, still has a way about him. He used to be renowned across the Underground as a friendly, chatty fellow, making friends everywhere he went. He had a charm in his voice, the twinkle of his gaze, and there was never a monster that did not feel welcome in his presence, even with his occasional, good hearted pranks.
Papyrus lives in a reality of his own making, his madness a powerful delusion, a dementia so consuming that he is no longer aware of the real world.
They are an entity entirely other, with more than meat beneath their robes, and row their boat up and down the river continuously, searching for passengers (anyone they spot).
Undyne is a wreckage of her former self. She is almost completely blind (like most the remaining monsters in Waterfall), and relies heavily on an ungodly sense of hearing and smell through a vomeronasal system. She can see colorful blobs with her right eye, but no more.
The Temmies are a horde of ravening, senseless demons, completely blind from the pressing dark and roiling in a massive wave through the fetid waters and mud banks of the Dead Swamp.
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"As a denizen of the Void, disconnected in every way from the Underground, Gaster is untouched by the madness of the Hunger."
The Amalgams, formerly trapped in the True Lab, have long broken free of the Laboratory and swarmed out to hunt the paths and caves of Hotland. They are virtually indestructible, as they are no longer truly alive to kill, and starve continually for flesh.
Alphys retreated to the lab, once Undyne secluded herself in Waterfall and refused to see her, afraid of what the Hunger was making her into, and attempted to find a way to force a Reset on the world, to take it back before the Glitch. The days grew too long and dark for her, though, the impossible task of finding more Determination than Flowey now possessed pushing her further and further into paranoia and depression, and before the Hunger truly set in for her, she released the Amalgams from the True Lab and allowed them to devour her, blaming herself entirely for Flowey’s rise to power and existence in the first place.
Mettaton is a shattered husk of himself, his own machinery integrating with his soul inseparably and stealing all but the dregs of his mind and memory.
The former king of monsters, he was killed by Flowey when Frisk was a child.
When the Glitch broke over the Underground, those closest to it suffered the most. The Resort and all within it erupted into chaos, overtaking and nearly destroying Mettaton’s EX form in their madness. Catty did not survive the first wave of the Hunger, falling to a pack of starving monsters while attempting to forage through the garbage for food for herself and Catty.
Madjick’s tremendous magical prowess allows them control over their appearance, and gives them the ability to blend into their background for the purposes both of hiding and hunting.
Burgerpants currently holds sway in a section of New Home, a cruel and maniacal manipulator of those lesser than him. After his escape from the Resort, and his near murder of Mettaton, he initially secluded himself in his home and scratched almost all of his face off in his growing madness and despair, baring bone and muscle and tearing away his eyelids completely.
The anxious, easily aggravated ghost monster has sealed himself permanently in his physical host, terrified of the consequences of leaving. He escaped most of the violence of the Fear, isolated in the Dump as he was, and chose to never leave, suffering only minor damages to his form.