That is almost certainly a potato leaf strain tomato plant with the peach fuzz along the stems. Their seeds can look similar.
I'm battling aphids on my hot peppers too! I use hard sprays of water Loosen the misthead of the sprayer to deliver larger droplets, then spray from few inches away, and hard sprays and general misting of mild soapy water -- a squirt from liquid soap dispenser per 24 oz water which also contains small chunks of hot pepper and garlic. (I add a dribble --few drops-- of canola oil every 7 or 8 refills). For soap, I use liquid Castile soap -- Dr. Bronners or Whole Food brand Peppermint. You can also simply shave solid hand soap and dissolve. It's important to be sure you aren't using detergent, though dishwashing soap is often recommended. Also, pepper foliage seems sensitive to stronger solutions so use weaker solutions.
I visually inspect by turning the containers and looking at the foliage from every direction. Initially spraying with the soap solution gets some of the aphids moving and easier to spot. I squish with my fingers any on mature leaf surfaces both top and bottom. They "pop"
Pay particular attention to tiny new leaf budding out and to flower buds where the aphids cluster. Soap spray is useful there since the solution will form a droplet on the buds and pool in unfolding leaves (but another reason to use mild solution on these delicate growths). I like to follow with hard plain water spray after 10~15 minutes so as not to burn the leaves just in case. The aphids will be knocked right off of even the hard to reach nooks.
As always, don't spray in strong sunlight, especially right after adding new drops of oil. Oh, and I use filtered water in all my sprays. I use the soapy water every few days but since I mist the plants every morning, I also just use plain water to knock them off the flower and leaf buds. They sometimes climb back up but they're easier to squish when they are on the stem. When you do use the soapy spray, be sure to thoroughly spray the oil surface and all around the containers where they might have fallen. The soap/oil clogs their breathing holes and suffocates them.