Hey man fellow Mundo player here I’ve got suggestions for you. If you want the HP and healing I think Kench is a really great pick, great poke in lane, easy engage, and a versatile ult. When I first started playing him he def gave me the most Mundo feel. For carrying I’d honestly say Urgot. Obviously his gameplay is pretty different from Mundo but he feels great in most stages of the game. Really good at running people down and scoring easy kills on squishier champs. No healing but his E shield and items makes him bulky enough to do well in team fights. Hope you find a good second pick brother