The Character Gear System:[]
Each character's 4 main gear pieces have only 3 main stat enhancements and only the last stat boost on the 4th gear piece can be manually changed.
Strategy (Bios)[]
The importance of having bios to get as many characters' gears as possible from 15 to 20 can't be overstated, because Mega Tier 2 Tickets are the only alternative, and are much rarer than Mega Rank Up Tickets and other Rank Up Tickets. So, if you have a limited number of bios available for a character, for instance a character only available through the shifter system or the Danger Room, then the bios should be saved for the character's gears and tickets used to get the character from 1* to 6*. It would be remiss not to mention the other requirement for bios, uniforms: while Mega Uniform Upgrade Tickets are rarer than Mega Tier 2 Tickets, the number of bios required to get a relevant uniform to Mythic is 930, making saving bios which are in short supply for a uniform an endeavour that is so lengthy that it's almost pointless.