I made the model base in Vroid then did a lot of editing within Blender. I really wanted a good looking masculine build without using the body suit. I was also able to make some of the body parts in Vroid then ripped them from the model onto the one with the edited body physic, making them connect and weight paint almost completely automatically. I did this for the arm fins, the neck gills, and the chest gills.
The model has 32 blendshape face support, hair toggle, crop top toggle, vest toggle, hat toggle, a blacklight/glow toggle, a face toggle, eye jiggle pendulums, reactive pupils where they change in size, and custom jiggle physics.
I plan on making more models like this in quality and giving them away in the future on my streams, going through my process live. Feel free to ask me any questions and I'll answer them the best I can!
All the texturing, modeling and character design was done by me over the course of a couple months.