The last few encounters with Batman ended in failure. It is worth mentioning that Killer Moth once successfully imprisoned Bruce Wayne and reconstructed him through surgery, and successfully deceived the first generation Robin Dick Grayson.
And discovered Bruce Wayne's Batman identity. Ironically, he was later shot as a traitor by his own gang members and suffered from amnesia because of his injuries. Of course, later (in the cartoon period of the 1960s), he regained his memory.
Before restarting:
He was originally an antique thief. When he first appeared, he didn't know his real name, only that his prison number was 234026. After he got out of prison, he sold his stolen goods, used the pseudonym of Cameron Van Claire to mingle with celebrities in high society, and even became a friend of Bruce Wayne.
Personally, he worships Batman's costume and made a "moth car" according to Batman's appearance. He also drove his former employees to set up a "moth hole" and even had his own "moth signal" within his organization.