Onchain Block Invaders (OBI) is a fully on-chain, evolvable PFP collection with an onchain mechanism for swappable skins and color palettes. It supports the on-chain addition of new assets, allowing collectors to customize their skins and palettes. Importantly, each new skin and color palette added does not constitute a new NFT and does not impact the existing rarity system. While an OBI NFT is capable of supporting up to 32 skins and 32 color palettes, each NFT currently comes with 1 skin and a standard light color palette. Additionally, there are 2 color palette options for some NFTs, including a dark palette that was made available through a special minting event for those owners who opted to mint it. Enhancing its story-driven appeal, the collection boasts a bold, simple, and inclusive design philosophy, underpinned by fundamental shapes that synergize to form a unique visual language.