@RhaegarG
I can see some nods/design references for : Maou na Anoko to Murabito A (Villager A manga MC), Sword Art Online (Klein lookalike), FGO (shielder), Slime Datta, Onsen ni Tensei, HxH (summoning), CCS (the pin), Kyoukai no Kanata(mistaken suicide meeting), Yozakura Quartet (clothing pattern, skirt+scarf), Super Mario (cat rescue), Sims (the octahedron thingy), FSN (UBW). Some of them might not be exactly it but they're the oldest I can think where the references came from.
There are some non-definitive ones too like manga meat, bikini armor, non-combatant isekai mc, game end isekai summoning, yes no dialogue, chuuni fmc and butterfly save point.
The side ponytail reminds me of D-frag too