need to finish off sibling set, names i have so far are:
micah thomas
avery elise
olivia rose
lucas william
ella noelle
looking for one more girls name, i like violet, but i would like to go with something more unisex (but still soft sounding) to match up with avery, since olivia and ella are very girly. also open to any suggestions on any of my names. thanks 
I like your other names, and I love that you don’t want [name]Avery[/name] to be left out as the only girl with a unisex name.
So here are my suggestions:
[name]Riley[/name]
[name]Sawyer[/name]
[name]Scout[/name]
[name]Emery[/name]
[name]Ellery[/name]
[name]Elliott[/name]
[name]Alexis[/name]
[name]Wren[/name]
[name]Taylor[/name]
[name]Reagan[/name]/[name]Teagan[/name]
[name]Reese[/name]/[name]Rhys[/name]
And a couple middle name suggestions:
[name]Grace[/name]
[name]Margot[/name]
[name]Lily[/name]
[name]Anna[/name]/[name]Anne[/name]
[name]Marie[/name]
[name]Emily[/name]/[name]Emilie[/name]
[name]Pearl[/name]
[name]Ruby[/name]
[name]Jane[/name]
[name]Amelia[/name]
[name]Kate[/name]
Now, a couple combos:
[name]Riley[/name] [name]Margot[/name]
[name]Sawyer[/name] [name]Marie[/name]
[name]Scout[/name] [name]Amelia[/name]
[name]Emery[/name] [name]Jane[/name]
[name]Ellery[/name] [name]Grace[/name]
[name]Elliott[/name] [name]Lily[/name]
[name]Alexis[/name] [name]Pearl[/name]
[name]Wren[/name] [name]Kate[/name]
[name]Taylor[/name] [name]Anne[/name]
[name]Reagan[/name] [name]Violet[/name]
[name]Teagan[/name] [name]Ruby[/name]
Good luck! 
I agree with the suggestion of [name]Riley[/name], [name]Alexis[/name], and [name]Taylor[/name] since they share similar popularity right now with [name]Olivia[/name], [name]Avery[/name], and [name]Ella[/name].
I’d also suggest [name]Peyton[/name], [name]Brooklyn[/name] and [name]Addison[/name].
[name]Zoe[/name], [name]Chloe[/name], and [name]Makayla[/name] aren’t unisex but I think they have the same spunk as [name]Avery[/name].
Here are some unisex names that you might like:
[name]Addison[/name]
[name]Morgan[/name]
[name]Jensen[/name]
[name]Cailin[/name], or another spelling if you prefer
[name]Delaney[/name]
[name]Haven[/name]
[name]Harper[/name]
[name]Ever[/name]
[name]Evan[/name]/[name]Evyn[/name]
[name]Devon[/name]/[name]Devyn[/name]
[name]Dylan[/name]
[name]Leighton[/name]
[name]Quinn[/name]
[name]Brynn[/name] (it actually started as a boy’s name) or [name]Brinley[/name]
[name]Ashton[/name] and [name]Tristan[/name] are cute for girls and I personally love [name]Rooney[/name] for a girl, as in actress [name]Rooney[/name] [name]Mara[/name]
Maybe a girly name with a boyish nickname:
[name]Josephine[/name] or [name]Joanna[/name] - [name]Jo[/name], [name]Joey[/name]
[name]Charlotte[/name] - [name]Charlie[/name]
[name]Alexandra[/name], [name]Alexis[/name], [name]Alexa[/name] - [name]Alex[/name]
[name]Samara[/name] or [name]Samantha[/name] - [name]Sam[/name]
[name]Jessamine[/name]/[name]Jessamyn[/name] or [name]Jessica[/name] - [name]Jessie[/name], [name]Jess[/name]
Good luck!
love [name]Delaney[/name], seems to fit with the other names well, any ideas on mn?