(I have this shit sitting in my inbox for two years, so let me get to it)

Since Elio's my main OC across various media, he has different inspirational sources depending on the story he's in. However, certain characters make up the core aspect of his personage - which gives him various degrees of consistency. I'll list them below:

🔲 [Yu Narukami]: P4's protagonist - specifically his anime counterpart. Elio takes after a good portion of his quirks and mannerisms. Initially wanted to have Johnny Young Bosch voice Elio, but opted out for Zeno Robinson - who had the perfect pitches for Elio's vocal range, not to mention the Black VA rep. His skill with a sword also stems from Yu.

🔳 [Kotone Shiomi]: P3's Female Protagonist. Like Yu, she'd adopt various personality aspects - especially her upbeat and feisty nature, in addition to a pair of headphones being critical to his design. Like her and Yu, Elio has a voracious appetite.

🔲 [Jose Natasha Violeta Alexandors]: The supporting character from The God of Highschool, and most definitely THE MOST PRIMARY INSPIRATIONAL SOURCE, BAR NONE!!! From his outfits to hairstyles to certain personality traits to his body type to his family situation, and even his fighting style. ̶H̶o̶n̶e̶s̶t̶l̶y̶,̶ ̶y̶o̶u̶ ̶c̶o̶u̶l̶d̶ ̶l̶a̶b̶e̶l̶ ̶E̶l̶i̶o̶ ̶a̶ ̶J̶o̶s̶e̶ ̶r̶i̶p̶-̶o̶f̶f̶.̶ If they existed in the same universe you'd pass them off as twins. If Jose didn't exist, Elio would drastically be different.

🔳 [Zhou Yuan]: Protagonist from Yuan Zun. Elio's overpowered nature, growth rate, sheer luck, and the string of victories come from Zhou Yuan. Like with the others, you can see aspects of his personality in Elio - specifically his loyalty towards his friends bordering zealotry, maturity and wisdom unbefitting his age, his lack of greed and arrogance despite his insane strength and wealthy upbringing, and general integrity - keeping to his word and repaying the kindness of others at his own expense.

🔲 [Hiro Kageyama]: DS2 manga iteration from Devil Survivor 2 -Show Your Free Will-. Again, personality-wise, Elio's inherited his calmness and passivity (albeit in moderate doses), in addition to his decisiveness and intelligence; Elio's abnormally immense charisma is something he also picks up from Hiro (and to a certain extent - Yu, a la his "Chad Factor").

🔲 [Childe]: The Eleventh Fatui Harbinger from Genshin Impact. Honestly, the amount of similarities between Childe and Elio is so much that it's frightening. Like Jose, I feel that Childe's an immediate source for Elio's core character due to similar backstories, battle lust and combat prowess, both being family men, a well-rounded homemaker, having secrets he doesn't want his siblings to know, spending time in a dimension against their will - growing stronger as a means of survival, the loss of light from their eyes (which Elio would regain in later years), and both being "Mr. Worldwide". Honestly, I can easily see the two being very close friends and rivals.