Hmmm...
1. Realize (Gundam Seed)-
Takane Shijou *I sorta of feel like any song made by Nami Tamaki could easily be owned by Yumi Hara.
2. Inside Identity (Chu2 demo Koi ga Shita)-
Yukiho,
Mami or Ami,
Miki,
Ritsuko*Just because. Promise me, it'd work.

EDIT: I just remembered that Yukiho's voice actress plays Kumin... so perhaps Yukiho or for fun,
Yayoi.
3. Hanabi (Bleach)-
Makoto* The bleach opening. She'd kill that song.

4. Zzz Acapella Ver. (Nichijou)-
Azusa*The original singer, Sayaki Sayaka has a soft tone in her voice like Azusa. It'd be perfect.
5. Aoegeba Toutoshi (Nichijou)-
Azusa or
Yukiho*Same reason as the one before. Yukiho has a nice vocal range and I think it may be nice for her.
6. My Ballad (Nichijou)-
Azusa*Period.
7. Onnanoko Otokonoko (School Rumble)-
Miki or for laughs,
Chihaya*It's a cute song...
8. Perfect Blue (Dragonaut)-
Hibiki 9. Lovers (Naruto Shippuden)-
Kotori*Kotori's voice is beautifully amazing.
10. Toki Wo Kizamu Uta (Clannad AS Opening) -
Chihaya or
Kotori*Of course.
11. U Can Do It (Naruto Shippuden)-
Hibiki *Love the song. I think it'd sound really good for Hibiki
12. Endless Soul (Ikkitousen Xtreme Xectors)-
Takane and
Chihaya or
Kotori13. Kanashii Hodo Aoku (Sasameki Koto)-
Kotori14. You (Samurai Champloo)-
Kotori15. Taiyou Iwaku Moeyo Chaos(Haiyore! Nyaruko-san)-
Ami/Mami,
Yukiho,
Miki*

16. My Favorite Things *Jazzy Ver (Sakamichi no Apollo & Sound of Music)-
Yukiho or
Iori*The piano is beautiful and I'd think it'd go well with a softer voice like Yukiho's or Iori's.
17. Try Unite (Rinne no Lagrange)-
Hibiki or
Yukiho18. Wasurenai yo... (Rinne no Lagrange)-
Hibiki or
YukihoOkay, I think I'm done.