En means 'the being'. A being is any entity who has, or has ever had a consciousness. En is used to replace he or she or it or their (singular). En is also used to replace him, her (non-possessive) and them (singular). En is very useful in replacing a character's name when describing them. En is also useful in labelling any person or other being whose gender is unknown or irrelevant. Animals should be referred to as he, she, him, her or en - never 'it'.
b. The being of light telepathically adjusted the imperfect neurons in es human subject. En was pleased with what en saw.
In the first example, the child probably had a gender. If that gender was known, it would be perfectly reasonable to label the child he, she, him or her. However, in the second example, the being of light had no genitals. Therefore, es gender was irrelevant.
Under no circumstances should the ambiguous terms 'their' or 'them' be used in the singular context again , or 'it' in reference to a non-human being.