I don’t think [name_f]Indigo[/name_f] is too wacky! Especially with the nickname [name_f]Indie[/name_f] or [name_f]Indy[/name_f].
[name_f][/name_f]Other ideas you may like…
[name_f][/name_f][name_m]Robin[/name_m]
[name_f][/name_f][name_m]River[/name_m]
[name_f][/name_f][name_m]Hollis[/name_m]
[name_f][/name_f][name_m]Harbor[/name_m]
[name_f][/name_f][name_f]Winter[/name_f] (might be too much having [name_f]Sunny[/name_f] & [name_f]Winter[/name_f] though since they’re almost opposites?)
[name_f][/name_f][name_f]Briar[/name_f]
[name_f][/name_f][name_f]Scout[/name_f] (not quite a nature name but close?)
[name_f][/name_f][name_m]Oakes[/name_m]
[name_f][/name_f][name_f]Raven[/name_f]
[name_f][/name_f][name_m]Zephyr[/name_m]
[name_f][/name_f][name_m]Cove[/name_m]
[name_f][/name_f][name_m]Kuiper[/name_m]
[name_f][/name_f][name_m]Sky[/name_m] (too much with [name_f]Sunny[/name_f] maybe)
[name_f][/name_f][name_m]Phoenix[/name_m]