Ashlay Ashlay aonly ppears in the arena in Tatroi if you didn't recruit Cyuss. Go to the arena, go to the audience stands, and speak to him. He's pretty conspicuous. He will make some remark about how the fighters are weak, and then he will leave. After that, clear an arena round with Roddick. Then, go down to the docks in Tatroi. There, Ashlay will talk about how Roddick has potential, and he will join the party.
Erys To recruit Erys, Mavelle, Ashlay and Ioshua are required. If not, you can't get her. If you have these three characters, go into the Old Race Ruins, Northeast of Silvalant. Go deep into the ruins, until you find the room with Erys. Pick the 2nd option when Ioshua goes crazy, and you will get Erys. Keep in mind that if you choose to recruit Erys, you will lose Mavelle forever.
Ioshua To get Ioshua, you must first, after your adventures in Astral, select to go to the Purgatorium when given the choice. In other words, you must visit Purgatorium as soon as humanly possible. The first opportunity is after the incidents in Astral. Go to Purgatorium, and from the main entrance, go back to the world map and hug the mountain range to the right of Purgatorium, the one that leads to a dead end. It will eventually take you to the secret entrance of Purgatorium. Ioshua will then request your help, and join your party as you explore Purgatorium.
Mavelle In order to recruit her, you must have either Ashlay or Ioshua (or both) in your party. After the party reunites for a night drinking, she will join. Periccci Once the Emblem Quest begins, return to Kratus and start a Private Action. Talk to Millie, and choose Pericci when given an option of three names in the conversation. Equip Roddick with the Ocarina, and play it near the cat. Pericci will then join.
Welch To recruit Welch, you must make sure you have the Silvant Emblem, which you obtain during the Emblem Quest. Then, from the town of Ionis, go in the direction of Van City. Eventually, you'll reach an area on the world map with two bridges. Head to the forested area to the west between the two bridges and navigate through it to find a house, Welch's hut. Choose the first option to get Welch. Keep in mind that if you have more than seven characters already in your party, she won't join!