You're not the only one, I have a lot of number 3 in how I built up the lore for my guy Jin too
- He used to have 3 cosmic light-based elements : fire (sunlight, plasma, magma and lava), frost (moonlight, stellar wind) and lightning (starlight, nebula clouds and aurora waves)
- Now he has only fire, but still in 3 types : magma stones (solid), lava (liquid) and flame (gaseous)
- He can shapeshift between 3 forms : elephant (more a tank and can hit really hard), boar (can move and attack much faster) and shark-orca (mainly power-focused)
- His weapons are made of 3 materials : iron (raw damage), silver (effective against undead) and white gold (effective against big bad ones, like demons, gods, angels, etc => this is the number 3 in his workshop name