half-cousin

1- Half-pibling's child / Parent's half-nibling.
2- Person who, in relation to the other person, has zero parents and one grandparent in common.
3- Half-first-cousin.
4- Half-1C.

My half-cousin is a good person.

first-cousin

1- Pibling's child. / Parent's nibling.
2- Person who, in relation to the other person, has zero parents and two grandparents (maternal or paternal) in common.
3- Cousin.
4- 1C.

My first-cousin is a good person.

double-first-cousin

1- Child of parent’s full sister and of other parent’s full brother at the same time.
2- Child of paternal aunt (father's sister) and of maternal uncle (mother's brother) at the same time.
3- Child of maternal aunt (mother's sister) and of paternal uncle (father's brother) at the same time.
4- Nibling (biological) of mother and of father at the same time.
5- Two parents's nibling.
6- Person who, in relation to the other person, has zero parents and four grandparents in common.
7- Double-cousin.
8- Double-1C.

My double-first-cousin is a good person.

cousin

1- Pibling's child / Parent's nibling.
2- Person who, in relation to the other person, has zero parents and two grandparents (maternal or paternal) in common.
3- First-cousin.
4- 1C.

My cousin is a good person.