Double Homework got twin redheads and is complete. Only annoying thing is thry use their own engine which kinda sucks compared to renpy. Other than that it is great.
Likely to milk the games, if people begin to complain about not enough action then use handjobs, footiobs etc to get as much as you can out of the supporters.
Depends on the type of game. Sandboxes 100% need one or they are unbareable, something like SummerScent has many paths so a walkthrough is nice, but if there is only two or three paths a walkthrough is not really needed.
Some handpicked ones would be
Manhwa:
Eleceed
The Greatest Estate Developer
Nano Machine
The Legend of the Northern Blade
Doom Breaker
Manhua:
Top Tier Providence
Evolution Begins With a Big Tree
Im an Evil God