If you did not go through Chapter 2x, Saffi will now appear as NPC reinforcements in Chapter 13 with the Lifis' gang. This will only occur if you have conquered Chapter 2 as normal and have not gone through the Chapter 2x.
As for what will happen to Saffi if she does not go to Chapter 2x, I feel that the majority of people will think that it will be a naughty story. However, looking at the content of her conversation with Lifis and Shiva, don't you think that Saffi will somehow convince the whole gang of Lifis to come to Tahra? So I made this.
I think that Saffi, because of her high growth rate of Strength, would be able to defeat all the pirates with her bare hands, even if they attacked her.
Saffi and her friends have been leveled up appropriately for their late arrival, so they appear with already promoted. When Saffi leads the group on horseback, they simply look like the trio of L'Arachel, Rennac, and Dozla. I think you will find this interesting.
Conditions for joining Saffi and her friends
She joins when Leif talks to NPC Saffi. Lifis and Shiva will also join at the same time.
Mob pirates remain NPCs. There is no survival benefit even if the mob pirate is still alive at the time of the conversation.
About the Shiva's power-up event
When this event occurs, the additional event where Saffi casts the Magic Shield spell on Shiva does not occur. Instead, Lifis will appear with the Magic Shield skill learned.
Differences from the regular Saffi
Saffi who joins with this event will receive support effects from Lifis and Shiva.