videogamesdensetsu:

Monster World IV / モンスターワールドIV (Mega Drive - Westone - 1994) Part 1

Character designers:
Maki Ohzora / 大空真紀 (who did the character illustrations)
https://twitter.com/maki_ohzora/
http://www .pixiv.net/member.php?id=1395989
http://www.mars.dti.ne.jp/ikj/ohzora/
http://web.archive.org/web/20080622162022/http://www.linkclub.or.jp/~ohzora/

Mina Morioka / 盛岡 三奈
http://pink.ap.teacup.com/mina/
http://cyan.mina1111.com/profile.htm

Part 2:
http://videogamesdensetsu.tumblr.com/post/148836998210/monster-world-iv-%E3%83%A2%E3%83%B3%E3%82%B9%E3%82%BF%E3%83%BC%E3%83%AF%E3%83%BC%E3%83%AB%E3%83%89iv-mega-drive

See also:
A Monster World IV dōjin by chara-designer Maki Ohzora
https://twitter.com/romyukoihana/status/527354951593234434
Aisha from Monster World IV by her original character designer Maki Ohzora / 大空真紀:
https://twitter.com/maki_ohzora/status/595419547991158785
Monster World IV world map remade by Maki Ohzora
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=37328299
Illustration for an unused Monster World IV track: “Wonderful Southern Islands”. It was meant to be used in “Ocean stage”. According to MW4 composer Jin Watanabe “It is a tribute to the original Wonder Boy.”
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=28139842
The track is available here:
https://soundcloud.com/doublebytes/wonderful-southern-islands

Sources:
https://www.facebook.com/MWFan2012/photos
Pix'n Love 23
Mega Drive/Genesis Collected Works
Monster World IV sprite sheet:
https://twitter.com/maki_ohzora/status/558478921197314049
Monster World IV data sheets:
https://twitter.com/maki_ohzora/status/476645156959961089
https://twitter.com/maki_ohzora/status/378055359346139136