is there any homebrew can fix Jap character problem??

i have got a moded US wii, i can play most of the japanese game normally, but some can't display japaness characters, instead it display some strange signs, is there and fix for this??

None that I know of. Sorry

huh, this is interesting, those games probably do not have embedded font and make use of the internal ROM font data (or wherever it is stored in the Wii)
this would mean the SJIS font is not stored the same way on US/EUR and JAP consoles

I'm afraid there is no fix for this

I suppose he could change his region to JAP. (assuming Tona's ARchanger install the font package too...)
but he would still need to know Japanese...