I was bumping off some ideas of what fusion gem they would be together, and I was leaning towards a Jasper, but I chose Viridine because it can come in a pure cut or on its own (which is somewhat similar to Larimar physical-wise). Plus, it’s a sweet and short name! ^^
Personality-wise, I’d think Viridine would be the most worrisome mother like figure ever, and would avoid getting into tough situations. I wanted to try and find a fusion between the weapons and ended up with the shield with a chain attached, so Viridine could use it for defense and offense (kinda treating it like a frisbee/yo-yo thing)! Honestly I think they would be a somewhat stable fusion, but would split when heartfelt things hit them. Sphal would be there to try and cheer up Larimar in those times and take over in order to stay fused.
Hope you enjoy! ^^
Virdine (my version) (c) Fyreglyphs
Larimar (c) Scorching-scotch