"Seems to [...]": how to express tha indirect object?
"那个人看起来"(that man seems) is perfectly fine 
You can omit "看起来"  in "我觉得那个人看起来" and just write "我觉得那个人" 


There are other choices:


對我來說，那個人 ( to me, that man)
在我看來，那個人 ( from my point of view, that man)
我看那個人 ( I see that man/ that man, to me)