no.
It should be capitalized if it directly precedes someones name.
Only is they are in the begginning of a sentence of someones name such as the name AUTUMN.
A polite way of referring to someones obesity.
Look at the death certificate
It is referring to a person that owns or drives a Toyota.
their birth certificate / ask them / ask their friends / ask their family
Sub is used on Twitter when you are referring to someones tweet but you don't actually retweet the tweet in question. It's mainly used when everyone understands who you are referring to.
iris, which is the colored part of the eye surrounding the pupil.
Euthlesia is not a word I am aware of, you may be referring to euthanasia, which is the concept of deliberately ending someones life in order to relieve pain and suffering in a legal way.
in someones cuchi in someones cuchi in someones cuchi
You capitalize the c and the g if the Cool Guy is someones nickname; you don't capitalize the c and the g if it's just any cool guy or a description. Example: We call my friend Jeremy, Cool Guy. I hope that I meet a cool guy at the party.
Otousan is someones father. Chichi is referring to your own [My dad] there are other sayings, more or less formal: informal: papa, tousan formal: otousan, chichi