these are all names for neutral chao.i found these on gamefaqs. i knew some of them but i cant memorize them all. anyway the key is, Y=swim, P=fly, G=run, R=power
GG - Sonic Chao
The speed chao will take on a DARK blue tint, and his spikes will curl down
to create a Chibi-fied, miniature Sonic! Very cool.
GY - Dolphin Chao
The speed chao will turn light aqua, and the head and torso will extend and
become very elongated and streamlined.
GR - Boxing Chao
The speed chao will turn purple, and the spikes will arch upward. The
(natural) arms will end in VERY large fists.
GP - Elf Chao
The speed chao will turn blue-purple, and the spikes will CURL (not arch) up
and around. The (natural) feet will have a curl similar to elf-boots.
YY - Frog Chao
The swim chao will become a very light green, the "snout" on the head will
round off, creating a very spherical cranium. The (natural) ears are long
and streamlined. Give this chao a natural tail and ears, and it becomes a
hardcore swimming machine.
YG - Dino Chao
The swim chao will turn a medium-green, and the head spike will chorten and
form a blunt end.
YR - Sumo Chao
The swim chao's torso will expand exponentially, and it will become a hideous,
massive, very non-cute obese "Jerry Springer" reject. This thing is ugly.
YP - Monster Chao
The swim chao's head will curl upward, similar to a regular chao, but it will
turn dark green and pink. Very bizarre-looking.
RR - Flame Chao
The power chao will not change shape, but turn a dark, DARK red. Neat.
RP - Devil Chao
The power chao's two spikes will elongate HEAVILY, and the upper spike will
point straight up. The (natural) arms have HUGE fists with pointed
spike-knuckles. This is the most demonic-looking chao you can create.
RY - Rocket Chao
The power chao's whole head will elongate, creating the rocketlike shape.
RG - Dash Chao
The power chao's spikes will curl downward, similar to a GG (Sonic) Chao.
PP - NiGHTS Chao
The flying chao will turn a dark purple, with the two spikes elongating into a
very jesterly head shape, (intentionally) just like NiGHTS, from Sonic Team's
classic Saturn game! The chao actually floats off the ground as it walks, and
its (natural) wings are HUGE golden blades!
PR - Hook Chao
The flying chao's spikes will curl upward in a hook shape, and it will turn a
dark purple-red.
PY - Torpedo Chao
The flying chao's head will take on a distinctive bullet-shaped head, with
LONG, flat head spikes. The (natural) wings are long and thin. This thing
is disturbingly cool.
PG - Ram Chao
The flying chao will turn and orange-pink and the spikes will curl toward the
neck, forming an odd, ramlike appearance.