10 painted characters: Gen, Heng, Hong, Yu, Jia,
7 painted characters: Ke, Yan, Bing, Bo, Hong, Fu, Jiang, Shan, Chen
The above are the 10-stroke and 7-stroke characters from the Kangxi Dictionary. There are many more, but I think these characters are more suitable for personal names.
The following is the name I gave your son. I don’t know if it will satisfy you.
Liu Hongfu, Liu Hongjiang, Liu Genyan, Liu Jiayan, Liu Hongbo, Liu Jiabing,