In character doujins are normally for the current year/ recent shows. When you get into the classics and nostalgia works they are made by the old school fans like BLACK DOG so they tend to be WAY out of character. We just find the fun in them and laugh about how it could never go down like this.
p.s
If you need to picture a In-Character Haman work just think of her recruiting newtypes with some combination of psychic mind sex like a Gesundheit manga. She starts with Char but it doesn't work because Char only likes lolis and then through practice she turns into a shotacon by trying to get Judau in the end of Gundam ZZ. She learns the technique BTW from Kamille in the end of Gundam Zeta. So yeah the world will probably end long before that work is ever made.