Dynamo never fully made sense to me in Megaman X5. He is responsible for one of the biggest atrocities in 21XX, the Eurasia incident. But then, he acts like a chill, goofy rival when you interact with him. He also never leaves a strong impression, gameplay wise, and he is never called out for his actions regarding the Eurasia crash.
His goofy and ruthless sides never really went together, to form a coherent character, to me. He doesn't seem like the kind of guy who would slaughter an entire Space Station and send it crashing on Earth.
Then came the Batch 2 for Viral Nightmare which featured Dynamo as a boss, and really made his characterization work:
- Motivation: In his datalog we see a flashback pre-X5 where we see Dynamo>! is bored out of his skull and willing to see the world burn. in order to make some entertainment happen!<.
- Ruthlessness: Before his fight with X/Zero >!he kills a rival reploid while calling it a "friendly duel"!<, making it clear that his affable persona is mostly an act, for his own amusement.
- Gameplay: First, he is a lot more challenging, making his menace level believable. Second, he is an absolute troll and a very dirty fighter as can be seen in this Youtube short by PowerGuyGG (Don't click if you want to experience his dirty tricks yourself).
In conclusion, he makes perfect sense now as a character, and is a very entertaining scumbag, willing to do anything for his own amusement.
I hope we get to see more of him with this personality, even if it's only on fan projects.