Puzzle & Dragons: Japan Version Fist of North Star Silver Egg Souther (Updated)

parika's YouTube video featuring mostly Souther usage on making 10 combo boards

Gettingworst's sub-Reddit post about Souther

From most of people's reported rolls, I seldom see people getting Souther and although it might all just be due to randomness, Souther seems to be quite useful for combo leaders and really fun.

Update: Interesting finding from Puzzle and Dragons Forum, Souther takes more experience to max level compared to the other silver eggs (posted by Dando) and kumomo with the link to the collab egg machine rates (estimated?) Souther has the lowest rate of the silver eggs!