Heroes Phantasia is a crossover JRPG for the PlayStation Portable, with characters from nine different anime series. It is being developed and published by Namco Bandai, and features a battle system similar to Valkyrie Profile's.
Characters
Blood+:

Saya Otonashi
The main character of Blood+. A katana-wielding chiropteran Queen.

Hagi
A chiropteran Chevalier, and Saya's bodyguard.
Darker Than Black:

Hei
The main character of Darker than Black. Hei, also known as the "Black Reaper", is a Contractor with the power to generate and manipulate electricity. He is an expert martial artist and wields a knife attached to a metal wire.

Suou Pavlichenko
An ally of Hei's, Suou is a Contractor with the power to materialize an anti-tank sniper rifle.
My-HiME:

Mai Tokiha
The main character of My-HiME. She has power over fire.

Natsuki Kuga
An ally of Mai's. Natsuki wields a pair of hanguns with unlimited ammunition.

Mikoto Minagi
A good friend of Mai's. Mikoto wields a two-handed sword.

Midori Sugiura
Midori wields a double-edged axe.
Sgt. Frog:

Sergeant Keroro
The main character of Sgt. Frog, and the leader of the Keroro Platoon.

Corporal Giroro
The Keroro Platoon's weapon expert.

Sergeant Major Kululu
The Keroro Platoon's tech expert.

Lance Corporal Dororo
Dororo is the Keroro Platoon's ninja assassin.

Private Tamama
The youngest member of the Keroro Platoon.
Sorcerous Stabber Orphen:
OrphenCleo Everlastin
Majic Lin
Read or Die:
Yomiko ReadmanNancy Makuhari
Rune Soldier Louie:
Louies-CRY-ed:
KazumaRyuhou
Slayers Revolution:
Lina InverseGourry Gabriev