1) Your MC and all the girls can all be customized in the character editor before you even start the game. Which you should totally do.
2) Built in cheat menu, hit F1 for phone, click settings, last option "scripts" - there is a tab for "max girls" (or something). You can crank it up to 99. Requires restart.
3) Don't actually put 99 girls on island. Your computer will explode. Once the limit is upped, go back to any of the data terminals and select "swap girls" - only instead of swapping you'll find a bunch of purple slots beneath the original four. Click any purple slot and you will be able to add new girls.
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Let me tell you, the most difficult task in
any Illusion game is trying to make the MC look like an actual man instead of some ninety pound uberdweeb and making girls that don't looking like unrealistic, eye-cringing mutants that only look like women in the abnormal minds of Japanese hentai developers who've clearly never gotten within six feet of an actual woman in real life.
If ever become Dictator of the World, I'm going to lock every anime artist on the planet into a dungeon with their release being dependent on drawing
one realistic human face and twelve realistic human noses.
I suspect they'd all starve to death.