OVA refers to original video animation (full name: original video animation), which refers to the animation works that are watched for a fee. This word plays an important role in the spread of Japanese. It can be used as an animated work launched by OVA and will never be shown in movies or TV.
The o of OC has the same meaning as the o of OVA. OC refers to an individual's original role, but OC is not limited to the secondary circle. Many wives with the same humanities have their own OCs. Usually, these original characters are also called the children of the wife.
OC source:
1, more foreign anime fans in Europe and America, such as Adventure Time and My Little Pony; This kind of OC often has a certain background story, and exists in the linkage of official roles/settings. It can be but not necessarily a self-mapping under another set of world outlook settings, which usually implies the creator's understanding and expectation of the original work.
2. Animal fences at home and abroad; This OC is mostly a mirror image of self or self-ideology. For example, OC is a kind of bisexual fluorescent fox with flying ability, which is generally young.
3. Domestic secondary dimension/circle drawing/circle setting. Many times these OCs are just a skin, a picture, which basically does not include background settings, and does not include artists at all. The purpose is to socialize rather than create.
Reference to the above content: Baidu Encyclopedia -oc