The Tokyo University Egogram (TEG) has been recognized as a valuable psychological tool for transactional analysis (TA). TEG has been revised from version 2 to version 3, and the authors have investigated its use in research involving university students. The key findings were as follows: a high prevalence of AC-dominant (dependent) types, a high occurrence of CP-low (gentle) types, dominant child (C) types were more common than parent (P) types, and few cases of A-dominant types were observed, regardless of whether students were in the science and technology departments. The occurrence rate of composite types was low, while that of single ego factors was high. First-year students tended to exhibit low CP and high AC, indicating a need for lifestyle guidance.