You can find all NTE playable character around the map (Vers 1.0)

I think there is more. Since some character have so many encounter and spott. But this is what I have found so far by exploring and from other players who share their experience through various forums. 00:00 - 00:41 Mint (Achievement) 00:41 - 01:18 Lacrimosa 1 (Achievement) 01:18 - 02:17 Hotori (Achievement) 02:17 - 02:33 Sakiri (Achievement) 02:33 - 03:08 Nanally 1 (Achievement) 03:08 - 03:20 Nanally 2 (Achievement) 03:20 - 03:52 Baicang (Achievement) 03:52 - 04:33 Jiuyuan (Achievement) 04:33 - 05:26 Fadia (Achievement) 05:26 - 05:53 Lacrimosa 2 (Achievement) 05:53 - 06:15 Nanally & Taygedo 06:15 - 06:32 Aurelia 1 06:32 - 06:55 Aurelia 2 06:55 - 07:32 Adler 1 07:32 - 08:14 Adler 2 08:14 - 08:44 Lacrimosa 1 08:44 - 09:19 Lacrimosa 2 09:19 - 09:34 Lacrimosa 3 09:34 - 09:49 Lacrimosa 4 09:49 - 10:13 Lacrimosa 5 10:13 - 10:47 ETD 4 team 10:47 - 11:14 Baicang 11:14 - 11:42 Skia 11:42 - 12:22 Fadia 12:22 - 12:48 Hotori 12:48 - 13:15 Hotori and Daffodil 13:15 - 13:48 Daffodil 13:48 - 14:22 Nanally,Edgar,Sakiri 1 14:22 - 14:56 Nanally,Edgar,Sakiri 2 14:56 - 15:43 Edgar 1 (Achievement) 15:43 - 16:34 Edgar 2 16:34 - 16:58 Edgar & Sakiri 16:58 - 17:20 Mint 17:20 - 17:36 Akane 17:36 - 18:11 Haniel 1 18:11 - 18:41 Haniel 2 (Achievement) 18:41 - 19:05 Haniel 3 19:05 - 19:47 Jiuyuan 1 19:47 - 20:20 Jiuyuan 2 20:20 - 20:48 Hathor 1 20:48 - 21:08 Hathor 2 (Achievement) 21:08 - 21:36 Hathor 3