Maybe find him a girlfriend or boyfriend Either have him do something that angered Poseidon/Amphitrite so for a punishment they took away all of his fish, making him depressed OR have Poseidon curse him so every fish he touches dies
Dae-Ho is rather unique. Unlike most guardians who might just have a love for their specific animal type, Dae-Ho obsesses over fish, going as far as buying or rescuing almost every fish he sees. Due to this he can become overprotective over certain things, especially his "fishies".
Dae-Ho also has the ability to make everything he does seem adorable in a way. Whether it be falling or getting icing on his nose from a cupcake, he manages to make it seem adorable. Whenever he is with friends, they either associate him as the baby of the group or the adorable one. His actions normally come of as that of a child, even though mentally he is all there, he likes people to think he's childish, in hopes that they might treat him nicer. As well as being childish and adorable, he is often at times awkward.
Although Dae-Ho is childish and obsessive over fish, he has great potential to become a good leader, he's just never had the chance. After living with Poseidon and Amphitrite, he learned how to become a leader from Poseidon, watching him as he commanded his servants. Dae-Ho would then train with his fish, trying to command them, although it hasn't really worked.
For years, the gods and goddesses have watched on while the humans developed through the years, as they advanced both personally and technologically. Lately one thing has become quite clear to them; humans have a habit of being very irresponsible when it comes to their environment and the animals that reside within that environment. They came to a decision, fearing for the safety and longevity of their sacred animals, they have decided to create a special group of nymphs to help protect their sacred animals.
These nymphs’ life forces are each attached to the animal they are a nymph of; if that animal becomes extinct, the nymph will die. The gods considered the fact that here are thousands of animals and creatures that roam the earth, but not wanting to over extend their powers, they have decided to only concern themselves with the animals that are sacred to them.
When they aren’t out in the world helping other nymphs and helping to protect their animals, they spend their time at camp.
Summer of 2012
After Amphitrite created Dae-Ho, he stayed with her and Poseidon down in Poseidon's kingdom. It was during this time he got into collecting different kinds of fish, and as the summer came to a close, he began buying multiple fish at a time from a pet store in New York. After collecting fish from the summer of 2012 to spring of 2014, Poseidon crafted Dae-Ho a large tank for all of his many small fish, and when Dae-Ho went to camp in June, Poseidon placed the tank in his room.
Powers of an Animal Guardian:
They have a telepathic/empathetic connection with nature and other nymphs. They also have a special, stronger, connection with other animal nymphs
As they are nymphs they do not age, remaining eternally young.
Their senses of smell, sight and hearing are more enhanced, enabling them to sniff out monsters, track down demigods, etc.
They are able to summon animals to aid them, they have the best control over their own animal type
Each type of animal nymph has their life force attached to that species, so if a species were to go extinct the nymph would die
Each nymph is able to change into the type of animal they are, and only that type. So the bear nymph could not turn into a mouse, but it could turn into a grizzly, black bear, polar bear, etc.
While In animal form they have all the normal abilities of the animal. So if they are a hawk they can fly.
While in regular nymph/person form, they only retain passive characteristics/traits from the animal. So if they are a hawk, perhaps they are claustrophobic in enclosed spaces, but they cannot fly