No. Vivo S1 does not have auto call recording. But you can use Apps available on the Google Play Store.
Yes, Vivo S1 comes with 18W fast charger in the box and the mobile has fast charging support.
No. Vivo S1 does not have a notification light but it does have Always-on display.
Vivo S1 is available in 2 color variants - Diamond Black & Skyline Blue.