“Recruiting Mercenaries” was introduced in TOS version 10.2, Summoners can spend coins to recruit a Mercenary as your Ally. Whenever there is a new character, the list will be updated accordingly. Details are as follows:
Update Schedule for Recruiting Mercenaries List:
Characters from Ultimate Stage and Guild Events – The day after the end of the Stage or Event.
Characters from Biweekly Stages – On the same opening day of Stage.
Characters from Version Update – After Version update.