1) I remember there used to be this cartoon show where this guy was
driving down a road in his red corvette......I remember watchig
this about 10 years ago.

HaHaHaHa!  I remmember that!  That was from when cartoons first started 
being shown on Saturday morning!  Around the time of Pole Position!  By 
the way, you have it backward: The boy had to INGEST something HOT to 
turn into a car, then get cold to turn back.

3) This a question: Ryouga's shishi hokodan is a negative emotion attack,
right? So, someone only needs to have negative emotions, right? Or does
it specifically need depression? Or would sadness, anger, and rage work
too? 

Only depression, as far as I know.

This is for a fan fict and I need to know. Oh, where did he learn

this? From Cologne? 

No.  He learned it from an ancient scroll he got from an engenier/martial 
artist who was using the technique for escavation.

....

from Cologne? Is is that cold/hot trick he got when Happosai weakened
him? ...

Yup.

--HAYES