Thread:Shikifan/@comment-29427540-20180524160957/@comment-27971189-20180703145108

I said back then that Summer Servants are popularity based (as confirmed by DW), with each of them carrying unknown theme.

Summer 2016 is pure popularity, mainly DW and TM waifus. Summer 2017 is popularity among AOE Servants (my guess, but I'm 100% sure it is popularity among AOE because Helena, Fran and Nobu-- also Raikou).

If the leak is true, the only connection I found among them is their childhood experience. All of them living life full of stress during their childhood. Which would make sense if Medusa Lily is the one representing players choice. For players familiar with Fate franchise, you would pick Medusa as top answer for 'interesting childhood life'.

I tried thinking about any others like ST NP, buffs, debuffs but Jeanne and Quetz keep killing the idea that it makes 'childhood life' to be the most plausible connection among them. Medusa being Medusa Lily instead of her OG self seems supporting this.