Characters or personalities could be categorized into four different sections:
1. Section of jeopardizing or self-destructive characters, like excessive gambling, drug abuse, excessive drinking or smoking, sex abuse, whoring, child abuse, etc.
2. Section of human general demerits, like bad temper, self-center, selfishness, stubbornness, jealousy, rebellion, etc.
3. Section of disputable character, with half merits and half demerits, like excessive boldness, timidity, overindulgence, overwork, etc.
4. Section of general personal interests, habits and preferences, like habit of eating, drinking, dancing, reading, collecting stamps, coins, toys, preference of colors, figures, size, etc.
The first section is the hardest to modify or refine. Some of these behaviors are considered to be mental illness, and need to have special organizations and large group of specialist doctors or nurses, to alienate the victims in a far, remote and isolated areas for a long period of supervision and medication. Away from the crowd, the friends, the stereotype and the environment the victims are familiar. Examples like rehabilitation center for drugs or drinking, the doctors and nurses will provide tough mental reform and body co-ordination and adaptation to help the patients rehabilitate themselves from drugs or drinking, in a remote area having minimum temptation and disturbance. But once they move back to the real world, a high percentage will fail again in resisting the addiction and temptation from their friends or other media.
The second section has detailed description in other paragraphs.
In the third section, every disputable character has its own merits and demerits. For example, a strong muscular guy can protect you or beat you; a dumb guy is stupid but honest. Time will bring out the good and bad sides of each character; you can love or leave a person by the different sides of the same character. The bad side of their character can separate even couples with similar interests and personality.
Most people believe people who have similar interests and habits can have a better chance of staying together longer. Similar interests and habits mean you will have more time to do things together, and have more chances to argue about different opinions, finding out their demerits and provoking each other. Therefore, people with compatible character will still separate or divorce.
The success of our marriage or relationship is mainly relying on our attitude and acceptance towards our merits and demerits. To understand better on each side of our character, can help us handle our relationship better and prevent overreacting from different unexpected demerits.
Below are a list of merits and demerits of each character:

(1) A strong muscular guy can protect you or beat you.
(2) A dumb guy is stupid but mostly honest.
(3) A chicken is a coward but make less trouble.
(4) Good temper means they won't fight for any injustice or insult.
(5) Bad temper means they will fight for your insult or against you.
(6) Bravery means they will try anything dangerous or provocative.
(7) Active person will give you good and bad suggestions.
(8) Passive person will listen to you but has no suggestions.
(9) A leader wants to lead everything.
(10) A charming person can attract your attention as well as others.
(11) A fiery person may still have a hiding heart.
(12) A nice guy may still have temper and make mistakes.
(13) Don't expect a perfect guy to be perfect everywhere and every time.
(14) Females have an attentive heart to look at every small detail while males are usually unaware and will be blamed for it.

The above analysis is not 100% certain, these human qualities are only representing the majority of our human conduct, and there are still a lot of exceptions.
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This whole theory is similar to the ancient Chinese theory of "Tai Chi" or "Yin and Yang" from Taoism (I am not a Taoist). This Taoist theory says yin and yang are the basic law of the whole universe, everything is separated or judged by two opposite substances or theories, one is yin and the other one is yang. Yin represents the female or the feminine side of the whole universe, and yang represents the male or the masculine side. Some of the examples are female and male, moon and sun, sky and earth, bad and good, wrong and right, devil and god, etc.
Every cloud has a silver lining; every matter, judgement or personality should contain half good and half bad. But these quite depend on the smartness of our judgement, and how much good or bad we can discover from each matter, judgement or personality. There are no absolute good or bad in each case. If this sounds confusing let me give you two good examples with multiple point of views and angles to help you understand better.
Second World War, the most destructive and devastating war to happen to human kind. Tens of millions of life were killed, so many buildings and facilities were destroyed, billions of dollars of lives and properties were burned and washed away, and taking the Europeans so many years to rebuild. Can you think of anything that is good from an incident like this? I guess 100% of my readers will say no. Then what is the good side on this?
Awakening. The Second World War had awakened most of the Europeans from the belief of wars. Before this war, most people believed wars were inevitable, only conquering others could keep them in peace. If you had good harvest for a few years, and had money to build a strong army, then you should start conquering others before someone did. Therefore big wars and small wars happened constantly anywhere around the world wherever there were humans living.
Not until the Second World War, this war was so shocking, that not only shocked our land, but also shocked every European's heart. Awakened them from the belief of wars, through killing, bloodshed, and destruction to conquer and unite; awakened them from the hate and anger between nations and tribes.
Therefore, Europe can peacefully unite into one giant country to make history. Most Europeans could drop down their national feud, superiority and differences, giving up their anger and hate, which had built up through wars and massacres for milleniums. Hand holding hand, heart linking heart, with love and sincere, to do something we have never done before in the entire human history, to set a standard for other countries and continents to learn and follow.
Therefore in one point of view, we should thank Adolf Hitler to help us awakening. We should thank him to push the evil behavior of humanity to the extreme, to introspect our stupidity and rotten behavior, to awaken us from our old thinking and stereotype into new ground breaking, to enlighten us on the importance of peace and forgiving.
The next example, we should thank Chairman Mao of China to awaken the communists from their belief of Karl Marx and Leningrad. He had expanded communism to such a terrifying stage through the Great Leap Forward and the Cultural Revolution to challenge, fight and struggle against their parents, teachers, scholars, and classes. Leading to millions of lives killed and dozens of historic sites, sculptures and relics destroyed, and eventually cooled down the heat of so many devoted communists.
These had given Deng Siao Ping the ease to do political and social reform, bringing China a gigantic success in a truly great leap forward in wealth, social structure, national growth and foreign investment, which not only shocked the capitalist world, but also the most importantly the communist world. With the help of the Tiananmen Square incident, and the hard work of other great leaders, triggered the explosion of the desperate communists and communist citizens, leading finally to the chain reaction of the falling of the communist countries and system.
Things will develop in the opposite direction when they reach the limit. Human kind will enlighten when they push everything to the extreme, when they see the worse, the most terrifying, the most desperate, and the most painful. Sometimes it may take you decades or even centuries to see the consequences of the other half.
We will not enlighten from our selfishness to protect our environment and our world. Until we make something destructive and irreversible, until we chop down all our trees, completely erase the ozone layer, destroy the entire food chain, and put an end to our own world and proving Apocalypse to be correct. By that time, how many people will remain in our dead world to confess our sin, stupidity and selfishness? Selfishness will not only destroy our relationship and family, and most importantly and fatally, it will destroy our world.
If we don't enlighten from our behavior and selfishness, our marriage or relationship will end up on the same route. How many times are you going to re-marry? How many incompatible reasons you want to use to divorce or separate again and again?
Everything has the positive and negative sides, and both sides are equally balanced. Time will show the good and bad effects of each matter. The more attentive and moderate, the less selfish and self-centered we are, the more we will discover and judge correctly on both sides. And easier for us to take the bitter with the sweet and accept all the non-detachable merits and demerits.
In the fourth section, everyone will have his or her own general interests, habits and preferences. Someone like soft music, but others prefer hard, someone like western food, but others prefer Chinese or both, someone like sweaty sports, but others prefer doing nothing, someone like yellow, but others may prefer green. There's really no accounting for taste, and no classification for preferences. Soft music is no better than hard rock, Chinese food is no better than an hamburger, and white is no better than black. Every preference will have its own distinct features to fit different personalities and life style, and shouldn't be classified as good or bad, high or low, elegant or out-dated, and beautiful or disgusting.
But we seem to be contradicting with different interests, habits and preferences, we are arguing about the color of the walls, turning off the noisy and annoying hard rock music, throwing the comic books in the trash can, discriminating others interests, humiliating others habits, and criticizing others preferences. Simply because we are self-centered, we think what we are doing is right, what we like is the best, or what we choose are the most suitable choices. Any criticism will be considered impolite, offending our dignity, and humiliating our personal interests and tastes.
A lot of our arguments come from this category, when we are choosing between two radical preferences, participating in his or her habits we don't like, or giving up our interests to fulfil his or her needs. If choosing either choice will provoke the other one, then how can we strike a happy medium to please both sides?