Well if youalready went with pokemon and digimon try using one of
Yu-gi-oh chars yugi would fit other you chosethe most but i would chose Joy becouse he tries harder and he learns unlike yugi who is already good.
And if you like smth more dangerous try
someone from fate/stay night (i would suggest either Shirou or Archer cuz i like him) <They are fighting/trying to survive in the war of holy grail so the song fit it well>.
You could also use Kenichi from History's strongest disciple Kenichi (he is learning martial arts and is slowly taken into the world of martial art which is basically a fight to sruvive)
Kei kurono from Gantz (Forced to kill alien or get killed by them so it is a strong story of survival)
Almost any main char from Tokyo majin gakuen kenpuchou ( getting super powersput you into a state where you can't trun back becouse evil is trying to kill you).
The main hero from Yuu oh sei (Strangled on an dangerous/unknown planet where almost anything can kill you especially at night, and the only way out is to become the strongest one)
The main from Linebarels( it has robots and the main protagonist is trying to save the world after getting a giant robot)
Jil from Tower of Druaga (When summer comes monsters start to atack from the tower and alot of ppl called scavangers go into that tower to kill the "main boss"at the top but the way is hard so it kinda makes it a story about survival and winning)
Bonago (tho i haven't seen it yet but 11 or more kids and teenagers are tricked into a game which is actually a reality so they need to survive the "game" and it has robots too

)
If you are looking for smth a bit different and less dangerous but still a story about trying to live you might want to check
tokyo magnitude 8.0( a young girl with her younger brother is trying to go back home after a huge earthquake, why it makes a survival story is becouse the earthquake still hits sometims offcourse a smaller one and mostly around our main chars also they have to endure cold nights, fever and other de\iseases)
11eyes almost everyone from there(sometimes a "red night" appears and they find themselves in a different world where they need to survive demons and monsters)
I hope i could help
