I think the name [name_f]Sherin[/name_f] gives off a warm, kind, and approachable vibe. It sounds elegant but also friendly. My favourite nicknames from your list are is [name_f]Sherie[/name_f] and [name_f]Rin[/name_f]. I think [name_m]Sheri[/name_m] could work nicely as well as it looks a little cleaner without the -e at the end in my option.