eternal optimist

1. A person who never ceases to give up hope in something they believe.

2. A person who will continue to believe in something or a positive outcome till the end of time.

That James is such an eternal optimist, i have never seen him worried a day of his life.

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pulls their weight

Someone who does what is required of them. Usually this refers to duties in a group task or work environment. Best compared to some one who is a slacker.

John is someone who pulls their weight. He is never late, always on time. He does what ever is required of him.