Ones like this list below
Moegi Yuu
Sakyo Aya
Yamamoto Kotetsuko
Fujikawa Ruri
Kamon Saeko
Kobato Mebaru
Junko
Mishima Kazuhiko
Madarame Hiro
Abe Akane
Nekota Yonezou
Tennouji Mio
Sakuraga Mei
Nakamura Shungiku
Ootsuki Miu
Kanda Neko
Wada Mayuko
Chiba Ryouko

It's easier if you say what you like in a manga... Saying the mangaka is waaaay to vague, for example, Junko has some nice mangas, but others I really don't like. I can't relate what all these mangaka have in common, because they have a lot of different manga. If you say "I want a cute art style", "Slice of life yaoi", "School life" it would make it a lot easier. If you say "I love mean semes", "I like big seme x small uke", it would be even more easier to recommend something!

Well, here is a "cute art" style with "cute relationships" (well, Kanda Neko, Junko, Ootsuki Miu and Nekota Yonezou have a cute art, so I think you are asking for that?):
http://www.mangaupdates.com/showtopic.php?tid=35607
https://www.mangaupdates.com/showtopic.php?tid=40165
https://www.mangaupdates.com/showtopic.php?tid=26051
http://www.mangaupdates.com/showtopic.php?tid=40578
http://www.mangaupdates.com/showtopic.php?tid=26106
http://www.mangaupdates.com/showtopic.php?tid=24488
https://www.mangaupdates.com/showtopic.php?tid=40016

OK then ones with

Older Seme Younger Uke
Art that looks good
Comedy is good too
Some Teacher/Student in it
Nothing with too much angst in it
Some like the manga below
Katekyo!
Nekoka Kareshi no Ayashikata
Honto Yajuu
Ubawareru Koto Marugoto Zenbu
Beast & Feast
Seiryou Saikyou Monogatari
Sawatte, Tokashite
Himegoto Asobi

Maybe:
Spotlight Lover by Kakine
Koisuru Bicchi-kun by Furukawa Fumi
Junketsu Drop by Kisaragi Manami
Furueru Yoru no Himitsugoto by Ogura Muku
Café Latte Rhapsody by Kawai Touko
Rutta to Kodama by Fujitani Youko
Rin! by Honami Yukine
Sannin Gurashi by Hirakita Yuya
Terebi-kun no Kimochi by Okachimachi Hato
Sawatte, Tokashite by Kobato Mebaru
Bukiyou na Silent by Takanaga Hinako
Me wo Tojite 3-byou by Aniya Yuiji
Hana wa Saku ka by Hidaka Shoko
Honto Yajuu by Yamamoto Kotetsuko
Usagi Otoko Tora Otoko by Honma Akira
Katekyo! by Moegi Yuu
Dame BL by various mangakas, but specially Kumota Haruko and Rotta Ikumi
Kimi to Parade by Kojima Lalako
Kiraboshi Dial by Natsume Isaku
Hana no Mizo Shiru by Takarai Rihito
Kurayami ni Strobe by Hayakawa Nojiko
Negative-kun to Positive-kun by Hideyoshico
Koutetsu no Baby Leaf by Sunae Hata
Slow Starter by Ichikawa Kei
Kuchizuke wa Niji no Ue de by Kakine
Bara to Yaban by Konjiki Runa
Uwasa no Oujisama by Mio Junta