Is it too masculine? I know [name_f]Elle[/name_f], [name_f]Ellie[/name_f], and [name_f]Lois[/name_f] are options, but I kind of like [name_m]Louis[/name_m] as a NN. Thoughts?
I think [name_m]Louis[/name_m] is cute. I also like [name_u]Lou[/name_u], [name_f]Lulu[/name_f], and [name_f]Elsie[/name_f] as nicknames for [name_f]Eloise[/name_f].
I love it- I would definitely use it if I had an [name_f]Eloise[/name_f]. The [name_m]Louie[/name_m] spelling is cute too.
I like Ouisi, like “Weezy”
I saw a survival show a while back and one of the girls was called [name_m]Louie[/name_m]. I can’t remember the name of the show, but I think she won the grand prize. (:
I like it, very cute!
[name_m]Louis[/name_m] does NOT work as a nickname for [name_f]Eloise[/name_f]. Unless you mean [name_m]Louie[/name_m], which is how the nickname is typically spelled? [name_m]Louie[/name_m] feels very masculine to me.
I assume you mean the [name_u]Lou[/name_u]-ee pronunciation of [name_m]Louis[/name_m], not the [name_m]Lewis[/name_m] pronunciation. If so, yes! It’s adorable.
I think [name_f]Eloise[/name_f] nn [name_m]Louis[/name_m] is gorgeous, but I would spell it [name_m]Louie[/name_m] as it’s more feminine. 
I think it’s cute. I have a fondness for boy-name nicknames for girls. I think either [name_m]Louie[/name_m] (how I would spell it to avoid confusion) or [name_u]Lou[/name_u] would work.