CHISE (CHaracter Information Service Environment) is an environment designed for character processing that does not rely on general-purpose character encodings. It does so by using a character ontology (the CHISE Character Ontology) that is based on labeled Directed Acyclic Graphs (DAGs) and describes a wide range of knowledge about characters in a machine-readable format. It can be said to function as a meta-system with respect to general-purpose character encodings such as Unicode, making it possible, for example, to locate the code point corresponding to a given Sinographic character glyph, or to describe the properties of characters that have not yet been encoded and enable them to be searched using those properties. In the CHISE Character Ontology, data curation for Sinographic characters has so far focused primarily on information related to characters themselves and to character encodings. However, in order to apprehend and describe Han characters appropriately, it is important to pay attention to changes that occurred over time in the conventional practices of the interpretive communities of people who read and wrote Sinographic characters. To this end, it is essential to collect examples of character forms used in different periods and regions and to link them to the character ontology. Moreover, while CHISE enables information on variant characters and related characters of a given Sinographic character to be described in a form that allows domain information and source references to be attached, providing concrete source evidence for the description of relationships among variant characters within this framework requires collecting usage examples from ancient character dictionaries and texts belonging to an array of genres, converting them into data, and representing them in a machine-readable form. This paper provides an overview of CHISE and, at the same time, describes an attempt to integrate into CHISE a range of related resources: (1) historical usage data of Sinographic character forms from the Hanzi Normative Glyphs (HNG) database; (2) data from displayed characters forms and annotations in ancient character dictionaries contained in the Integrated Database of Hanzi Dictionaries in Early Japan (HDIC); data on phonetic pronunciation of Sinographic characters and Chinese phonetics appearing in Japanese textual sources from the Heian and Kamakura periods onward, as recorded in the Database of Historical Sino-Japanese Readings (DHSJR); as well as data about characters from oracle bone script and the Sŏlmun haech’a | Setsumon kaiji | Shuowen jiezi 説文解字 held by the Institute for Research in Humanities, Kyoto University.