That's exactly what my friend did. She took perfect care of him while she was home, but forgot to pause him once while at school and ended up with Tsunotchi. Unfortunately, to a growing Tama, being alone for 7 hours is...... not good. If you hadn't forgot to pause him, I'm sure you would have ended up with a "better" character but you didn't do anything wrong. And anyway, don't be so sad. Forget the good/bad character theories and just enjoy your your Tamas for what they are, regardless of personality or health.