When he's fighting normal criminals, he should be very intimidating, but restrained and careful to induce no lasting harm:
When he's fighting the big bad, all hell should break lose:
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"Theodore Roosevelt, Jr., nicknamed "Teddy" or "TR", was born October 27, 1858 in New York City. As a young child, he was often sick and was stricken with asthma. Viewing this as a challenge, he proceeded to beat his asthma to death."-
Cracked