Egret: The Great Sage (2021)

Blurb:
A master elementalist, Egret lived his entire life in the company of elemental spirits, having felt shunned by human society for his immense power. After his death, he is reborn as the young prince Judas, a social outcast bullied for his quietness and small frame. With his trusty spirits by his side, Egret enters the elite academy Ruvar-H, where he must make friends and turn Judas’ reputation around. But with danger from his past life following him, can this great sage make it in the real world?

Source: www.anisearch.com/manga/67003