https://ouo.io/THrm3Y
https://www.doujinshi.org/book/548295/80s-vol.3/
http://www.toranoana.jp/mailorder/article/04/0030/08/46/040030084699.html

03 Elpeo Ple and Ple Two, from Gundam ZZ
04
05 Creamy Mami, from Magical Angel Creamy Mami
06
07 Minky Momo, from Magical Princess Minky Momo
08
09
10 High School Kimen Gumi
11
12 Kei and Yuri, from Dirty Pair
13 Matel, from Galaxy Express 999
14 from Space Adventure Cobra
15
16 from Great Detective Holmes (Sherlock Hound)
17 from Maple Town Stories
18

If you know the sources, please identify.

and the previus vol 1-2?

Base +7

04 Linn Minmay from Macross ?
06 Uchuusen Sagittarius
08 ???
09 Hibari Oozora from 'Stop! Hibari-kun' (famous crossdressing character)
11 Dash Kappei

after 13 (GE999) you switched to gallery page number instead of real page number.
I continue with real page number:

14 ???
15 Space Adventure Cobra
16 Samurai Pizza Cats ? (not 80s anime)
17 Meitantei Holmes/Sherlock Hound
18 Maple Town Monogatari
19 Some already seen + Memoru from 'Tongari Boushi no Memoru' and Nanako from 'Nanako SOS'

In front cover is also Minami Asakura from Touch

Base +49, Floripes +24

The girl with the "S" helmet (15/16) is either a character from or dressed as a character from Plawres Sanshiro. The animal girl after Creamy Mami reminds me of something from Moomin, but I don't think the revival series started until 1990.

Base +2