Someone who behaves in a sensible way, like an adult
mature
Someone who expresses opinions or desires strongly and with confidence, so that people take notice
assertive
Someone who is sensible and practical, in a way that is helpful and friendly
down to earth
Someone who seems unfriendly and without strong emotions
a cold fish
Someone who tends to believe that other people are good, honest, etc.
trusting
Someone who takes care to do things carefully and correctly
conscientious
Someone who says the opposite of what they mean in order to be unpleasant to somebody or to make fun of them
sarcastic
A person or thing that is very annoying
a pain in the neck
Someone who shows that they love or care about someone or something
affectionate
Not confident about yourself or your relationships with other people
insecure
Someone who's able to do or produce everything that they need without the help of other people
self-sufficient
Someone who is a very kind person has...
a heart of gold
Someone who's good at finding ways of doing things and solving problems, etc.
resourceful
(of a person) sensible; who can be relied on
steady
Someone who's kind and calm
gentle
Calm and relaxed; seeming not to worry about anything
laid-back
A person that you can easily persuade to do something, especially to give you money
a soft touch
Kind to somebody who is hurt or sad; showing that you understand and care about their problems
sympathetic
Having made a definite decision to do something and not letting anyone prevent you
determined
Someone who's honest and open and says what they think
straightforward