
Only now did I notice but the characters' names refer to Greek deities and mythologies.
Psyche or Psykhe is the Greek goddess of the soul. She was born a mortal woman, with beauty that rivaled Aphrodite.
In Greek mythology, Medea is the daughter of King Aeëtes of Colchis, a niece of Circe and the granddaughter of the sun god Helios. Medea figures in the myth of Jason and the Argonauts, appearing in Hesiod's Theogony around 700 BC, but best known from Euripides's tragedy Medea and Apollonius of Rhodes' epic Argonautica. Medea is known in most stories as a sorceress and is often depicted as a priestess of the goddess Hecate.
Helios, also Helius, in ancient Greek religion and myth, is the god and personification of the Sun, often depicted in art with a radiant crown and driving a horse-drawn chariot through the sky. He was a guardian of oaths and also the god of sight.

Translator ever shared this info about their names : http://www.mangago.zone/read-manga/i_want_to_be_you_just_for_a_day/nbt/iur_chapter-25/pg-9/

It's because his name is helio tropium, not helios... His name is not taken from the god of sun, but from the name of a flower 'heliotropium' (the myth is about the water nymph who fell in love with god of sun but betrayed by him, so the nymph turns into flower that face the sun, i think the character in this story still fit the myth, since helio is so devoted to medea (which her name is taken from helios's grand daughter) like the flower that grow toward the sun,
you can see more here : http://www.mangago.zone/read-manga/i_want_to_be_you_just_for_a_day/nbt/iur_chapter-25/pg-9/

Also iaros (the prince) is the korean writng of eros the god of love who married psyche, like medea is written as medeia (메데이아) in korean, eros is written as iaros (이아로스)
The greek name eros also has other pronunciation 'iaros' or something, you can see here : http://www.mangago.zone/read-manga/i_want_to_be_you_just_for_a_day/nbt/iur_chapter-25/pg-9/

Yes it's because '이' in korean can be romanized as 'i' or 'yi', also 'R' and 'L' sound in korean are represented as one letter "ㄹ", so the first fan-translator team (for chapter 1-19) in manga sites miss-romanized it as yialos
His name in official english webtoon is eros
Iaros is his name in official indonesian and french webtoon

I don't think Hal is perfect for Lippe because she needs someone she can talk to about her feelings, especially to vent about the hatred and sadness that she feels deep down about her past. So far she has been the only one who has been helping others but no one has helped her. So the first person to help her take this tension off the top will be the one who will become the special person for her. Now is just wait.
I was thinking and I suddenly had an idea/theory? , something like.
The association gave Saitama the name of the Caped Baldy , but they'll probably change his name when he gets really famous, right? And if his name will be "One Punch Man" (like the manga's title). That title would look amazing.