Guh

Adrian is a little bit older than Rocky

where he's temperamental and extroverted, they're a soothing balm of a personality. Calm, patient and very good at rubberducking others with their emotional problems

they're more quiet and get very stuck in their own mind sometimes - also hyperfixate on things and kinda need to be dragged out of a project by force on occasion. Their quietness tends to intimidate those that don't know them very well, but they're pretty much happy to just sit and listen. Rocky was always the more social one for both of them.

they're passionate about studying erid's different biomes, so they very easily hit it off with Grace, who's more than happy to learn more about the climates and lifeforms on erid AND can infodump about the interesting differences on earth in return

After Grace and Rocky leave Erid for their ambassador trip, eridian scientists keep testing with the stem cell cloning and gene editing tech they used to make Rocky's body, and also work on improving the consciousness transfer times... and Adrian, who's both very curious about earth and humans and wanting to maybe tag along with Rocky and Grace the next time a trip like this is being done, volunteers as test subject.