Sunny uses a modified Roman alphabet to write Esan, which appears to be a commonly-accepted way of writing the language (Wikipedia). Sunny writes a line under vowels where the common writing system uses a dot below. My current guess at the orthography system is below:
| Grapheme | Phoneme |
|---|---|
| a | a |
| an | ã |
| b | b |
| bh | β |
| d | d |
| e | e |
| en | ẽ |
| ẹ | ɛ |
| ẹn | ɛ̃ |
| f | f |
| g | g |
| gb | g͡b |
| gh | ɣ |
| gw | gʷ / ɣʷ |
| h | h |
| i | i |
| in | ĩ |
| ị | ɪ |
| ịn | ɪ̃ |
| j | d͡ʒ |
| k | k |
| kh | x |
| kp | k͡p |
| kw | kʷ |
| l | l |
| ll | lː |
| m | m |
| mh | ɸ |
| n | n |
| o | o |
| on | õ |
| ọ | ɔ |
| ọn | ɔ̃ |
| p | p |
| nw | nʷ |
| ny | ɲ |
| r | ɹ |
| rr | ɹː |
| s | s |
| sh | ʃ |
| t | t |
| u | u |
| un | ũ |
| ụ | ʊ |
| ụn | ʊ̃ |
| v | v |
| w | w / ɣʷ |
| y | j |
| z | z |