This is an interesting thought and one I would be on board with! Hope you like the headcanons!

Headcanons:

• The first to find out about Kosmo actually being a “human”, was Hunk. 
• When Kosmo was left in Hunk’s care inside his lion, he found a female human with long black hair and neon blue streaks on her hair and skin sleeping in the back.
• He screamed through the communicators, alerting everyone.
• But he quickly told them he just got scared because the mice were playing a trick on him.
• Hunk decided he wanted to find out first if it was really Kosmo before saying anything else. 
• He cautiously went to her unsure how to approach, but Kagome woke up and they were in a silent staring contest.
• Until Hunk finally called out her as “Kosmo” and she nodded.
• Kagome: “well if you would like to call me that still, I don’t mind.”
• Hunk: “SHE SPEAKS!”
• And all the paladins overheard his last sentence wondering who the hell Hunk was talking to.
• Hunk, after getting Kagome’s story of how she was a wolf and such, later had the other paladins stop so he could introduce Kagome.
• Hunk came out with a wide smile and telling everyone, “yo! The wolf is a pretty girl!”
• Keith: “we know that.”
• Hunk: “no! No! No! Like an actual girl! Human!”
• That is when everyone saw Kagome coming out with the mice on her shoulders and on the top of her head while wearing a simple Altean suit that Hunk had given her from the back of his storage. 
• Everyone was amazed that Kosmo had transforming abilities, but Keith was silent the whole time and stayed back.
• That was until Kagome faced him and simply smiled. 
• Lance took the opportunity to point out how he applauded Kagome for being able to get Keith speechless.