If your character had a voice actor...

Natalia would surely be Kotono Mitsuishi.... as Ebichu.

I don't know many JP voice actors, so...

Fuji - [url=http://www.youtube.com/watch?v=K-wl5JE4LyE:3mya2zpp]Brittney Karbowski[/url:3mya2zpp]
Rain - [url=http://www.youtube.com/watch?v=vy_LyqHuXfw:3mya2zpp]Christine Marie Cabanos[/url:3mya2zpp]
Kena - [url=http://www.youtube.com/watch?v=eVsLO82cEbs:3mya2zpp]Wendee[/url:3mya2zpp] [url=http://www.youtube.com/watch?v=9c_0-TG1eHo:3mya2zpp]Lee[/url:3mya2zpp]
Konata - [url=http://www.youtube.com/watch?v=4bk5o4Flslg:3mya2zpp]Melissa Fahn[/url:3mya2zpp]
I don't have an idea for Ina yet since she really doesn't talk much.

Sixx: Jennifer Hale, powerful voice actor for anyyyyy role she plays.
Alice: Tara strong, infamous for voicing many colorful characters, perfect for Alice.
Minako: Michelle Ruff, Rukia, Yoko, Crimson Viper, and Tsukasa, amazingggg voice.
Reika: Grey Delisle, awesome...and that's not because its the voice of Azula.
Elena: Brittney Karbowski, a wonderful voice for any type of character.

Sandy Starlight - Lenore Zann (voice of Rogue from X-men animated series)

As per intentional costume similarities and the only original character who I've always thought to have a voice actor for them (since her revamp)

I should craft a male wrestler so I can say he's voiced by Tim Curry.

Maybe have someone voiced by Tabitha St. Germain, too...

All though John is not anything like Tom Baker's famous charchter, the deep, resonant bass voice of Tom Baker (with an American accent) is somewhat how I imagine John to sound like.

https://www.youtube.com/watch?feature=player_detailpage&v=PMqmTVXgYZ4#t=25

This is a great example of what I'm talking about, a few seconds of this, around when he's talking about the snow, makes it a bit more clear.

I could actually see Tai being voiced by Vic Mignogna

Immediately I see that.

Did you agree with John?

Also to test that I wasn't biased, I had non fans listen to it and told them to imagine it in an American accent before I posted lol.

(Update)

Eliza Harenwood - (JP) Yuki Matsuoka - Voiced Alisa from Tekken. (Eng) Laura Bailey - Voiced Rise from Persona 4.

Damus Kirenko - (JP) Masanori Shinohara - Voiced Kazuya from Tekken. (Eng) Louis Mellis - Voiced Darth Sion from KOTOR 2.

Hao Hichiman - (JP) Shin-ichiro Miki - Akira Yuki from Virtua fighter. (Eng) William Word - Lee Chaolan from tekken.

Qi Lingxian - (JP) Ayana Taketatsu - Labrys from Persona 4 arena. (Eng) Karen Strassman - Kitana from MK9.

[youtube=425,350:yjd6t222]uYDhTpBNouk[/youtube:yjd6t222]
Because relevant.