Pairwise correlation of role loadings on PC2 is 0.89 between Qwen and Llama; Gemma differs (similarity <0.61) from others on PC2

Entities in the same semantic neighborhood but without a typed relation to this one — candidates for new edges or unrecognized duplicates.

• Pairwise correlation of role loadings on PC1 exceeds 0.92 across all model pairs, indicating remarkably high similarity of the Assistant Axis across Gemma, Qwen, and Llamafinding0.892
  Shows the leading component of persona space is model-universal
• In Gemma 2 27B, just 4 PCA components explain 70% of the variance among 275 character archetype roles (vs Qwen 3 32B needing 8, Llama 3.3 70B needing 19)finding0.819
  Key empirical support for Hypothesis 2 about low-dimensional structure of persona space
• Qwen3.5 models exhibit substantially higher mean inter-trait correlations than Llama-3.1-8B and Gemma-3-27B (mean off-diagonal 0.215 and 0.146 vs 0.090 and 0.078), indicating greater trait entanglement.finding0.805
  Architecture-specific difference in trait vector geometry
• Base and instruct Gemma 2 27B role PCs have cosine similarities of 0.93, 0.87, 0.83 for the top 3 PCs respectively; role vector cosine similarities >0.99 for every role pairfinding0.796
  Shows persona space axes are inherited from pre-training, not solely created by post-training
• Gemma's Assistant appears emotionally regulated and systematic; Qwen appears pedagogical and thoughtful; Llama appears socially intelligent and warmclaim0.793
  Model-specific characterizations of what the Assistant persona looks like across different models
• 4-19 principal components explain 70% of variance in role persona space across the three models (Gemma 4, Qwen 8, Llama 19)finding0.787
  Demonstrates that persona space is low-dimensional
• Qwen3.5-9B and Qwen3.5-27B show very high SP persona rank correlation (rho=0.959, p=4.32e-14) but diverge sharply on AS vulnerability.finding0.771
  Scale effects within Qwen3.5 family on different imbuing methods
• When steered to the extreme away from the Assistant, Llama and Gemma shift to a theatrical persona characterized by mystical, poetic prose; Qwen more often hallucinates a human persona at extremesfinding0.764
  Characterizes what is on the far end of the Assistant Axis away from the Assistant