Does anyone know of any manga similar to Samurai x, and ubel blatt. what i mean is the main character having a big secret that he was someone famous or a hero in his past.

Shin Angyo Onshi

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Reading: Kingdom, Sangokushi, Historie

I think King of Hell fits the description.

Ruroni Kenshin

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These people were all famous, though not necessarily heroes:
Defense Devil was the demon prince
Monochrome Factor won't say b/c it's a spoiler
Ningyou Kyuutei Gakudan
Trinity Blood (your mileage may vary)
Vampire Juujikai
Tales of Symphonia

Chrno Crusade - it's been several years since I finished the series, so I could be wrong on this
Immortal Rain - kind of, though he's treated more like a criminal
also perhaps Samurai Deeper Kyo - but this one I also finished a long time ago and the memory's pretty vague, but the protagonist(s) were someone pretty famous
Dragon Eye - unfortunately on hiatus, but it fits your requirement somewhat and is pretty decent (though his hidden identity is a pretty big spoiler)
Oresama Teacher - this is a shoujo comedy + action (well okay, there's lots of fights), where a girl is trying to hide the fact that she used to be a pretty famous gang leader before she transferred schools
Yanki-kun to Megane-chan - the main heroine used to be a very famous gang leader but she tries to hide it because she's now the class president. More of a comedy adventure type manga than shoujo
Gokusen - similar to the previous two in that it's about a female yakuza group's heiress trying to hide her identity while teaching at a deliquent school

Juuki Ningen Yumbor
Superior

Maybe~ o.o

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