The expression "a considered individual" is correct, although "considered" used in that way is a bit dated. Personally, I think the old-fashioned flavor of the dated usage contributes to the desired meaning.
Yes the phrase "a considered individual" does exist, but it does not mean a kind or thoughtful person, as you seem to think. It means an admired person.
The meaning (2) below illustrates what i mean.
1. Reached after or carried out with careful thought
deliberate: my considered opinion; a considered policy involving a measured response to provocations.
2. Highly regarded; esteemed.