King Andrias

King Andrias is a 30 foot tall newt with bluish skin and a lighter underbelly. He has pale yellow eyes. He is so tall that he towers over Anne, Marcy, Sasha, and his armored guards. Andrias is stocky and muscular, with white hair and a full beard, along with crows feet.

When he was younger, Andrias was smaller than he was as an adult with a small mustache, but did not have crow's feet or a beard yet. He also kept his hair in a bun.

After enduring a powerful blow from Anne, Andrias' cybernetic body was revealed, losing his left arm, leg and the tip of his tail. The damage to his body remains during the series' epilogue, where Andrias is still missing his arm and leg and his eyes have gone dim as a consequence of his sight failing, due to his implants losing functionality and refusing to get them repaired. His appearance is now disheveled, with leaf clutter present on his beard like those on Anne's hair.

Andrias wears a dark purple metal suit of armor that has an X shaped battle mark on the left abdomen over a lighter colored shirt with cuffs similar to a Victorian aristocrat. He wears a crown that has the Core's eye attached to his head and has pauldrons shaped like snail shells; the right pauldron has a smaller X shaped battle mark on it. He also wears a gold snake belt and a purple and yellow tunic.

During the epilogue, he sports a tan robe and brown trousers, and wears a stained purple robe that is attached to a dark purple hooded cowl, with the stumps of his missing limbs buttoned up. However, he keeps one of the metal boots he wore as a king. He has a leaf broach and Marcy's robot pin pinned onto his cowl.

As shown in "The Core & The King", Andrias, as a prince, was a warm and friendly person who deeply cherished the friendship he forged with Leif and Barrel, who he had known since he was a child. However, as the crown-prince of Amphibia, Andrias felt the weight and responsibility of invading Earth, and seemed to hold his father, King Aldrich, in high regard through his desire to make him proud, which also caused him to wonder if Leif and Barrel would still remain his friends after he takes the throne. He cared enough to give Leif an audience with his father to warn about misusing the Calamity Box, but after it fell on deaf ears, Andrias' doubt regarding Leif's intentions continued to deepen. This ultimately led to Leif betraying Andrias and stealing the Calamity Box, preventing the invasion, while also infuriating Andrias and causing him to sever his ties with Barrel as well. Ultimately, his father's gaslighting and manipulation turns him into the power hungry and ruthless tyrant he later becomes. Even after Aldrich has assimilated into the Core, he still continues to manipulate him for years.

When he first appeared, Andrias portrayed himself as a goofy, fun-loving monarch who dislikes following royalty mannerisms and etiquette that Lady Olivia follows and tries to make him act upon. Yet at times, he shows he has a serious and calm side to him as well. He has taken a liking to many human customs and slang. Andrias has a strong affinity towards puzzles and games, which was first evident when he gave Marcy a scavenger hunt with a hidden message. However, his true nature was foreshadowed when he was having a conversation with the Core.

In "True Colors", Andrias revealed his true nature as a dictator who believes that he should rule all worlds. He mocked Marcy for trusting him blindly, and continued to act with a cheerful demeanor while doing it. He has shown great ferocity in battle, even roaring at times. He is able to manipulate both Anne and Marcy into charging the gems on the Calamity Box, whilst keeping it a secret that the powers given to the three human girls would be removed. Andrias is also cruel in his authority, with some of the best examples of this being when he went as far as destroying a tower with people in it to demonstrate his abilities, later ordered his Frobots to strip Amphibia bare of its resources, and forced frog villagers to work in his factories.

As a result of his broken friendship with Leif and Barrel, Andrias has an overall bitter opinion on friendship, and he dropped Sprig out of a window even after Anne gave into his demands, attempting to teach the human girl a "lesson" about friendship and didn't show remorse for his actions. He had no problem revealing Marcy's darkest secrets to her friends just to break their friendships apart, and he ultimately allowed the Core to possess her.

Although he shows himself to be quite a skillful tactician, as he makes it clear to the Cloak-Bot to dispose Anne and the Plantars discreetly on Earth to avoid attract unwanted attention from the human about his upcoming invasion, he is impatient in terms of getting results, resulting in him "motivating" his Cloak-Bot to finish off Anne and the Plantars at any cost by activating the self-destruct sequence inside the Cloak-Bot. This eventually caused the Cloak-Bot to recklessly attack Anne and the Plantars wide open in public, which causes the US government to become aware of the existence of the Plantars and the Cloak-Bot, destroying his original intention of a discreet assassination. Furthermore, he also doesn't take losing very well, for after Anne bested him in a duel with her Calamity Box powers, Andrias became intent on eliminating the girl by any means necessary to get back at her, and later he destroyed the drone's remote and headsets with his sword in a tantrum when he failed to eliminate Anne once more.

For all his negative traits, though, he would later admit to Marcy that he had become fond of her, and even tried to convince the Core to pick someone else to be its new host. As the Core is painfully possessing Marcy, he looks away in shame while he does nothing to help her out. Even after the Core becomes "Darcy", he would show a somber look when interacting with her and is clearly still haunted by the breakdown of his past friendships. Still, he suppresses these feelings in favor of finally starting his long-planned invasion of Earth.

It isn't until his invasion begins in "All In" that Andrias starts to doubt his actions, as watching Darcy terrorize the resisting human army makes him flashback to the day he first met Marcy, how similar she was to Leif, and how he tried to convince The Core at the time to let him remove the power of the Calamity Box's stone rather than straight-up kill her. But when he fights Anne again inside his power suit, Anne guesses that he chose to shut himself out from others because like her once, he couldn't love himself anymore, though he vehemently denied it until Sprig read to him a message Leif left behind for him that caused him to breakdown in tears in regret. As a result, Andrias allowed Anne to strike him down, and afterwards, asked her to save Marcy from The Core, allowing the love he chose to shut out show itself again.

In "The Hardest Thing", he decided to change his ways by helping the Calamity Trio fight against the Core and stands up to it and his father, as he finally gets fed up with their abuse and manipulation he inflicted. After the Core's destruction, he was finally relieved that his family's reign of terror has ended once and for all. Before Marcy went back home to Earth, he remorsefully wishes her to take care. He later happily accepts his punishment of doing community service to fix the damage he and the Core caused, showing that he finally found peace and happiness inside of him.