Kraven got his powers through a combination of genetic enhancements and intense training in the wild. He developed enhanced strength, speed, and senses.
As far as I know, Thunderball didn't impersonate Electro. Comics usually have distinct character arcs and storylines for each character, and this particular situation doesn't seem to be a part of it.
Kraven did have powers in the comics. These included superhuman physical attributes like strength and agility, as well as expert hunting skills and a deep knowledge of the wild.
Kraven's powers come from a mix of factors. He experiments on himself with special serums and constantly challenges himself in the wilderness to develop superhuman abilities like superior reflexes and acute perception.
The electro origin story often involves the discovery and development of electricity. It began with early observations of static electricity, like when amber was rubbed and attracted small objects. Scientists such as Benjamin Franklin made significant contributions with his kite experiment, which helped in understanding the nature of electricity. Over time, the study led to the invention of batteries and the harnessing of electrical power for various applications.
The 'best electro story' could be about a young inventor who discovers a new way to harness electro - magnetic energy. He uses this discovery to power an entire small town that was previously facing energy shortages. This story shows the power of innovation and the potential of electro - related technology.