Man (Narcissist?)

From Jenny Everywhere Wiki

A man originally met his home dimension's Jenny Everywhere (then very young) as a very old man.

He eventually told her he wished he could have met her earlier in his life. Jenny, now grown up, heeded his wish and went back to an earlier period in his life. However, Jenny's influence resulted in the man taking up magic but also his mental health deteriorating, and he came to live in a mental hospital, which he had mixed feelings about.

However, Jenny, while staying in contact with the present-day version, popped to the future to meet the version of him from this timeline but after he'd left the mental hospital; this version of him thought it was worth it and gave Jenny a simple note to carry back to his younger self, reading “Stop whining and adapt! Haha, yours truly,”. To get her to bend the laws of Time again to get it to his younger self, he had bet Jenny a pint that she “wouldn't dare” risk a further paradox. (COMIC: Narcissist?)