thank you guys for more suggestions, pumpkin scissors and superior seem quite good. Havent looked in every other yet but I will try some. Some Ive already known but they dont really fit what I am looking for here but I still enjoyed them.
thanks.

so you want a guy with power who hides his power from others??
if thats so try:
Full Metal Panic!
Death Note
Shingetsutan Tsukihime
Dragon Who {manhwa}
Code: Breaker
Crimson Grave
Noblesse

or if its a hiden power the mc doesnt know they have try:
Kingdom of Zombie {manhwa}

if you dont mind it in reverse (hides the fact they have no power) try:
Mx0

sorry if any have already been suggested, got to lazy to read after 2nd post, so just consider those 1's seconded

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Ubel blatt
Nanatsu no taizai
Destroy and revolution...sort of
ES
Asamiya san no imouto (although not read much so don't know how much action is in there)
Ares
Tokyo ants (collection of one shots, so in chapters 2 and 3)
Zombie loan
Banana no nana
Kizu
Nightschool
Holyland

Anyone say One Punch Man ? Its isn't romantic but, the mc fits what you're looking for. It is also a face paced easy to read manga.

Immortal Rain the MC tries to stay out of everyone's radar, but he has a bounty on his head so its a bit funny...

If Immortal Rain counts, then so does Trigun.