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Anubis in more modern times. He wasn't that central to the original canon, but he's so much more interesting than the chief gods like Ra or Osiris. Also, it's hard to find a death god who's an okay guy. Also, he appeals more to Furries.
The same could be said for Hades (minus the furry part), who is another example of a god associated with death who was actually an okay guy. The Ancient Greeks were rather wary of him, naturally, but in modern times he gets a lot more appreciation... that is, if you are notDisney or Hollywood. This could be because he is a classic case of Dark Is Not Evil mixed with The Woobie, and/or because he was one of the only gods in the Pantheon who wasn't a complete jerk.
Disney tried to make Hades unlikeable. Thankfully, they failed, and the movie was that much better for this "failure."
Hephaestus has become this nowadays. His main flaw (his hideous looks) makes him seem to be more of a Woobie than back in Ancient Greece, when he would have been viewed as repulsive, plus, as with Hades, he's downright saintly next to his uncles, aunts, and cousins.
It doesn't hurt that his purview includes 'technology'.
Honestly, this goes for most old-school gods associated with death. The actual ancients were generally cool with them, then with the rise of Christianity everything was interpreted by people who weren't followers of these old gods and so often judged them on their job and appearance, though currently we seem to be moving back to the older interpretations. Hades was one of the three big Greek gods and no worse than Zeus (the most feared was likely Poseidon, given that they were a seafaring culture), Charon is just a dude doing a job, the valkyries and the Morrigan are totally hot or basically celestial accountants, we now actually remember that most "death gods" had other aspects (Hades was married to the goddess of spring, etc). It was actually gods like Thor, a drunkard and a rapist, who were the real assholes.
Ares/Mars was a very unpopular god for the Greeks, but the Romans claimed to be his descendants. It is worth noting that despite widespread modern misinterpretations, the Roman gods were not exact analogues of the Greek gods. Ares/Mars is a particularly notable case, as the Greeks saw Ares as the god of brutal warfare, while the Romans saw Mars as the god of warfare for the defense and spread of civilization. He even had an agricultural aspect leftover from an earlier Etruscan god and the fact that early Roman soldiers were basically drafted farmers. Some modern adaptations of Greek mythology also feature Ares in a much more positive light.
So long as you're not counting God of War as a "modern adaptation"... which it isn't.
So we're clear, when Homer referred to Ares he did so in almost the exact same terms as he did Scylla (of "and Charybdis" fame): Kukleion Athanaton. Evil Undying.
Both Sun Wukong and Hanuman got a disproportionate amount of attention, so much so that the former is now considered the main character of his story. The relationship between the two is interesting, but it's no surprise that they fill this role as they both get their fair share of badass moments.
Budai, a figure in Chinese folklore, often revered as a deity in Buddhism, is probably THE most popular Buddhist deity in western countries. While he is sometimes considered a bodhisattva, people with little to no knowledge of Buddhism often mistake him for THE Buddha. Chances are if you see a statue or other representation of a Buddha in fiction, it will be this plump bald man with a big smile.
Dionysus was another of those really popular gods. Whereas with other gods they tended to at least know what their names meant (Herakles = Glory of Hera, for example), with Dionysus they just knew he was related to Zeus somehow (Dios) and maybe something about a mountain named Nysa? Or a nymph or something? Fuck it. His worship was drunken orgies and they got so popular the Roman senate had to ban them except by special dispensation and the ban was ignored. Bachanals FTW!