I apologize in advance if someone already posted these, I'm just now kinda joining the kpop profiles forums but I would love to recommend you some!, I'm not sure if they would be your style but I highly suggest:
GMOST. (K Group promoting in Japan, Member 'Melo' has YouTube lives every friday where he talks to fans in Japanese and reads their comments, he is also known for liking fan comments on youtube including responding to people on Instagram. If you comment in english, he does his best to answer you!. (He is also known as 'The Pink Haired Guy' in 'Vivaoo' / 'Attraction' MV. (Which Attraction is such a fun MV I suggest it. It's my profile pic).
MADKID. (J POP Dance and Vocal Group).
Fandom Name. AXCEL.
Yuki and Shin are personally m bias's within the group.
As of 2020, they are under a agency the members created by THEMSELVES 'Future Notes'. The group is super positive and welcoming to fans, Yuki likes many fan comments and sometimes even replies to them!, they are really sweet and have improved so much (dancing and vocal skill) compared to their first singles.
They have songs in English and in Japanese. Some I suggest to you are: Rise, Faith, Get Up, Never Going Back, Giant Killing, Summer Time, Stuck on U, and Stay Gold.
One N Only. (J Pop Dance and Vocal Group).
Fandom Name. SWAG.
Fandom Colours. White.
If you have heard of this group, or if you haven't you have probably seen 'Category' MV which has picked up million's of views. The group is a Japanese Group and have promoted in Japan for a while. Personally I don't know to much (I found them in 2017 so I'm not a brand brand new fan but I'm not pre debut either). However, recently on their SNS and TIK TOK they have been wanting to promote in Brazil and have been doing promotion's online.
Some songs I love and suggest are: Category, Shut Up! Breaker, My Love, Dark Knight, Only One for Me, What About This?, I'm Swag and their latest song 'Video Chat' which even topped BTS 'Butter' on the Japan Charts at one point, another recent song is 'L.O.C.A'.