> Trademarks (usually) don't have such a broad application as "this name X is forbidden for use everywhere forever and ever". Unlike copyrights or patents, tra

> Trademarks (usually) don't have such a broad application as "this name X is forbidden for use everywhere forever and ever". Unlike copyrights or patents, trademark rights last for as long as they are used continuously to identify a source of goods or services. So, not quite forever and ever, but as long as they are used continuously by the same source. You're right that it will be fine to use the names of the characters as long as you don't create a likelihood of confusion with a senior user of the same or similar trademark.