Toyos have no leveling system, but you can improve them in many ways.
Stats are the most important information about your Toyo and define your Toyo’s real power. Improve them by training sessions, giving special items, and winning battles.
Each body part adds a stats bonus (in percentage) on top of Toyo’s base stats. Some body parts even give your Toyo exclusive cyber-attacks.
Their usage covers a wide range of possibilities. Attachables can add extra bonus stats, enable exclusive cyber-attacks, improve training sessions, improve Heart-Bond rate, increase earning rewards, etc…
They are usually not cosmetic items.
The more you enhance your Toyos, the more valuable it will become in the marketplaces.