Dumbest man in any room, he walks in right here.
Sentences should always start with a capital letter. A comma should be used when starting a sentence with a subordinate clause.
Since a person can't walk into a website, did you intend this to be a metaphor? "Right here" is awkward and redundant.
Poor poor Richard, dumb as can be.
You failed to capitalize first word in a sentence again. Not a complete sentence since there is no verb. Replace the period with a comma to tie the two phrases together. Is this failure to use grammar correctly while calling someone else "dumb" an attempt at irony or was it unintentional?
While your attempt to communicate was somewhat successful, you undermined your message by making so many grammatical mistakes.
In case all that went over your head, I did just call you "stupid."