Loki is Marvel’s first openly bisexual character

The comics did it years ago.

Loki, the trickster God of Norse Mythology gave birth to Odin's horse, Sleipnir, after turning into a mare to seduce the horse of a guy the God's had contracted to build the wall around Asgard.

In Lokasenna, Odin accused Loki of spending 8 winters on earth as a milk maid & giving birth to many babies.

So not that big a deal